{"title":"Flooring Underlayment","description":"\u003cp\u003eThe right underlayment depends on two things: your floor and your subfloor. Shop moisture barriers, acoustic foam, and vapor films for vinyl plank, laminate, and hardwood — or use the guide below to match the right one to your project.\u003c\/p\u003e","products":[{"product_id":"fanfold-underlayment","title":"FanFold XPS Flooring Underlayment – 100 sq. ft. (2mm)","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.375rem] font-bold\"\u003eFanFold XPS Flooring Underlayment for Laminate \u0026amp; Engineered Hardwood\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eCover more floor in less time. This fanfold XPS underlayment unfolds into wide 46.7\" panels that cover 100 square feet per box — fewer seams, less taping, and faster prep than rolled foam. The rigid extruded polystyrene (XPS) core smooths minor subfloor imperfections and creates a firm, stable base for floating laminate and engineered hardwood floors.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eBuilt-In Moisture Protection\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe closed-cell XPS construction acts as a moisture barrier between your subfloor and finished floor — a must over concrete slabs, basements, and ground-level installs. Skip the separate vapor film and protect your floor's locking system from subfloor moisture in one step.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eQuieter Floors, Warmer Rooms\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eWith a 72 IIC \/ 67 STC sound rating and a 22 dB Delta IIC, this underlayment cuts the hollow sound and footstep noise common with floating floors — a strong choice for upper levels, condos, and multi-family projects with sound requirements. The XPS core also delivers an R-value of 5.0 per inch, adding a thermal break that keeps floors warmer over concrete.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eRadiant Heat Ready\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eCompatible with both electric and hydronic radiant heat systems, so you can pair it with heated floors without compromising performance.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eFast, Pro-Friendly Installation\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003ePanels lay flat right out of the box, cut cleanly with a utility knife, and tape at the seams. No adhesives, no special tools. One box, one installer, one room knocked out before lunch.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhere it works best:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eFloating laminate and engineered hardwood floors\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eConcrete, plywood, and OSB subfloors\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBasements, condos, and multi-story homes where sound and moisture matter\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eRadiant heat installations (electric or hydronic)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eNot for use with:\u003c\/strong\u003e flooring that has pre-attached underlayment pad.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eBacked by a 25-year residential and 5-year commercial warranty.\u003c\/p\u003e","brand":"BuildDirect","offers":[{"title":"FanFold Underlayment","offer_id":44908109070633,"sku":"10094758","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0744\/4289\/9753\/files\/10094758-00-pdp_466580cf-3b68-43b7-9b37-1f9d31bf66bb.jpg?v=1692152216"},{"product_id":"3030-underlayment","title":"FloorMuffler 3030 Kraft Paper Underlayment \u0026 Vapor Retarder – 500 sq. ft. Roll","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.375rem] font-bold\"\u003eFloorMuffler 3030 Underlayment Paper – Breathable Moisture Barrier for Hardwood Floors\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eFloorMuffler 3030 is an engineered kraft paper underlayment that protects wood flooring from subfloor moisture the smart way — by slowing vapor without trapping it. As a breathable Class II vapor retarder, it shields your floor from moisture migrating up through the subfloor while still letting the assembly dry. It's the modern upgrade to asphalt felt and rosin paper, without the mess or the odor.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eBuilt for Nail-Down Hardwood\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThis is the underlayment pros reach for under nail-down solid hardwood. Roll it out over the plywood or OSB subfloor, overlap the seams, and nail your floor right through it. The slip sheet reduces squeaks from board-on-subfloor friction and keeps dust and debris out of the assembly — clean, fast, and code-friendly.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eOne Roll, Most Installs\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e3030 isn't limited to nail-down. Use it under floating engineered hardwood and laminate as a vapor retarder, and — unlike foam underlayments — it's fully compatible with flooring that has a pre-attached pad. When your plank already has cushion built in, 3030 adds the moisture protection layer without doubling up on foam (which can void flooring warranties).\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003ePro-Grade Coverage\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eEach roll covers 500 square feet — enough to knock out most whole-floor jobs with one SKU. At 36 inches wide, it lays out fast with fewer seams than narrow felt rolls, cuts cleanly with a utility knife, and weighs a fraction of asphalt paper.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhere it works best:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eNail-down solid hardwood over plywood or OSB\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eFloating engineered hardwood and laminate floors\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eFlooring with pre-attached underlayment pad (moisture layer only)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eWhole-home and multi-room residential or commercial projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eGood to know:\u003c\/strong\u003e Not for use with radiant heat systems. Over concrete slabs or in basements, use an underlayment with a full moisture barrier such as our \u003ca href=\"https:\/\/www.builddirect.com\/products\/fanfold-underlayment\" title=\"FanFold XPS Flooring Underlayment\"\u003eFanFold XPS Flooring Underlayment\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eBacked by a 25-year residential and commercial warranty.\u003c\/p\u003e","brand":"BuildDirect","offers":[{"title":"3030 Underlayment","offer_id":45481160048937,"sku":"15215731","price":60.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0744\/4289\/9753\/files\/15215731-00-pdp.jpg?v=1689132831"},{"product_id":"combofoam-underlayment","title":"FloorMuffler ComboFoam 2-in-1 Underlayment with Vapor Barrier – 100 sq. ft. (2mm)","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.375rem] font-bold\"\u003eFloorMuffler ComboFoam 2-in-1 Underlayment with Attached Vapor Barrier\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eTwo jobs, one roll, one low price. FloorMuffler ComboFoam combines a 2mm cushioning foam with an attached vapor barrier film, so you get underlayment and moisture protection in a single pass — no separate poly sheeting, no extra step. It's the budget-smart foundation for floating laminate, engineered hardwood, and solid hardwood floors.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eVapor Barrier Built In\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe attached film layer blocks moisture migrating up from the subfloor — the protection laminate and wood floors need over concrete slabs and in vapor-prone areas. Roll it out, tape the seams, and the moisture layer is done.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eReal Sound Numbers at a Value Price\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eComboFoam carries a 61 dB IIC and 54 dB STC rating — genuine, tested acoustic performance that takes the hollow clack out of floating floors. For bedrooms, living areas, rentals, and flips, that's the comfort upgrade tenants and buyers notice, at a price that works across a whole property.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eMade for Volume Work\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eAt 100 square feet per roll and 46.5 inches wide, ComboFoam covers rooms fast with fewer seams. It's lightweight, lies flat, cuts with a utility knife, and won't slow down a crew turning multiple units. For landlords, flippers, and production work, it's the spec that keeps material cost per door predictable.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eFrom the FloorMuffler Family\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eComboFoam is made by FloorMuffler, the underlayment brand pros know — backed by a 10-year residential warranty.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhere it works best:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eFloating laminate, engineered, and solid hardwood floors\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eConcrete and plywood subfloors\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eRental turnovers, flips, and budget remodels\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBedrooms, living rooms, and whole-home installs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eGood to know:\u003c\/strong\u003e Not for use with radiant heat systems or flooring with a pre-attached pad. Need higher sound ratings for a condo or HOA, or radiant heat compatibility? Step up to \u003ca href=\"https:\/\/www.builddirect.com\/products\/ultraseal-underlayment\" title=\"FloorMuffler UltraSeal Acoustic Underlayment\"\u003eFloorMuffler UltraSeal\u003c\/a\u003e.\u003c\/p\u003e","brand":"BuildDirect","offers":[{"title":"ComboFoam Underlayment","offer_id":45481160081705,"sku":"15225237","price":40.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0744\/4289\/9753\/files\/15225237-00-pdp.jpg?v=1689634034"},{"product_id":"ultraseal-underlayment","title":"FloorMuffler UltraSeal Acoustic Underlayment – 100 sq. ft. (2mm)","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.375rem] font-bold\"\u003eFloorMuffler UltraSeal Underlayment – Premium Sound \u0026amp; Moisture Protection\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eWhen the job calls for the quietest floor and a sealed moisture barrier, this is the underlayment pros spec by name. FloorMuffler UltraSeal is a premium cross-linked polypropylene (XLPP) foam underlayment with some of the highest acoustic ratings available — up to 74 dB IIC, 73 dB STC, and a 25 dB Delta IIC — under laminate, engineered hardwood, and solid hardwood floors.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003ePass the Sound Test\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eCondos, apartments, and HOAs often require flooring assemblies to meet minimum IIC\/STC ratings. UltraSeal's ratings clear the strictest building requirements, making it the go-to choice for multi-family projects, upper floors, and anywhere footstep noise is a dealbreaker. If a board needs to approve your floor, this is the spec sheet you want attached.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eSealed Seams, Continuous Moisture Barrier\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe signature UltraSeal lip-and-tape system is built into every roll: each row overlaps and self-seals to the next, creating one continuous moisture barrier across the entire floor — no separate vapor film, no taping every seam by hand. Over concrete slabs, that sealed barrier is what protects your floor's locking system and your warranty.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003ePremium Foam That Holds Up\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eXLPP foam delivers superior compression resistance, supporting the tongue-and-groove locking system of floating floors so joints stay tight for the life of the floor. At 2mm, it smooths minor subfloor imperfections and adds cushion underfoot without the sponginess that damages click-lock joints.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eVersatile Across Installs\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eUse it under floating laminate, floating or nail-down engineered hardwood, and nail-down solid hardwood, over concrete or wood subfloors. Compatible with electric and hydronic radiant heat.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhere it works best:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCondos, apartments, and multi-family projects with sound requirements\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eFloating laminate and engineered hardwood floors\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eNail-down solid and engineered hardwood\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eConcrete slabs and basements needing a sealed moisture barrier\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eRadiant heat installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eNot for use with:\u003c\/strong\u003e flooring that has a pre-attached pad.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eBacked by FloorMuffler's limited lifetime residential warranty and 10-year commercial warranty.\u003c\/p\u003e","brand":"BuildDirect","offers":[{"title":"UltraSeal Underlayment","offer_id":45481160114473,"sku":"10109597","price":79.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0744\/4289\/9753\/files\/10109597-00-pdp.jpg?v=1689634038"},{"product_id":"encore-underlayment","title":"FloorMuffler Encore Vinyl Plank \u0026 Rigid Core Underlayment – 100 sq. ft. (1.1mm)","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.375rem] font-bold\"\u003eFloorMuffler Encore Underlayment for Vinyl Plank \u0026amp; Rigid Core Flooring\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eMost underlayments aren't made for today's vinyl floors. FloorMuffler Encore is. This premium 1.1mm XLPP underlayment is purpose-built for luxury vinyl plank and rigid core flooring (SPC and WPC) — including planks that already have a pre-attached pad. Where standard foam is too thick and too soft for vinyl click systems, Encore's low-profile, high-density construction supports the locking mechanism instead of stressing it.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eYes — It Works With Pre-Attached Pad\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eHave rigid core flooring with the pad already attached? Encore is one of the few underlayments engineered to go underneath it, adding sound reduction and moisture protection without compromising the locking system or your flooring warranty. That makes it the answer to one of the most common questions in vinyl flooring — \"can I add underlayment under attached-pad LVP?\" With Encore: yes.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eBuilt-In Moisture Barrier\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe closed-cell XLPP core is itself a moisture barrier — no separate vapor film required. Over concrete slabs and in basements, that's the layer standing between subfloor moisture and your floor.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eQuieter Vinyl Floors\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eRigid core floors can sound hollow and clicky underfoot. Encore delivers up to 69 dB IIC, 62 dB STC, and a 22 dB Delta IIC, cutting impact noise and that hollow sound — and helping vinyl installs clear condo and HOA sound requirements.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eProtects the Click, Smooths the Sub\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eAt 1.1mm, Encore stays within the thin, firm profile vinyl manufacturers call for, with outstanding compression strength that keeps tongue-and-groove joints tight under traffic. It smooths minor subfloor imperfections, adds an R-4.0\/inch thermal layer, and is compatible with electric and hydronic radiant heat.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhere it works best:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eLuxury vinyl plank (LVP) and luxury vinyl tile (LVT) floating floors\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSPC and WPC rigid core flooring — with or without attached pad\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCondos, apartments, and rentals where sound matters\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eConcrete slabs, basements, and plywood subfloors\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eRadiant heat installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eBacked by FloorMuffler's limited lifetime residential warranty and 10-year commercial warranty.\u003c\/p\u003e","brand":"BuildDirect","offers":[{"title":"Premium Underlayment","offer_id":45481160343849,"sku":"15270229","price":79.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0744\/4289\/9753\/files\/15270229-00-pdp.png?v=1689634039"},{"product_id":"roberts-moisture-barrier-polyethylene-film-12-x-25","title":"Roberts Moisture Barricade 6 Mil Vapor Barrier Film – 300 sq. ft. (12' x 25')","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.375rem] font-bold\"\u003eRoberts Moisture Barricade – 6 Mil Polyethylene Vapor Barrier Film\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eWhen the spec sheet says \"Class 1 vapor barrier required,\" this is the roll. Roberts Moisture Barricade is a 6-mil polyethylene film that blocks moisture vapor rising from concrete slabs before it can reach your floor — recommended by the National Wood Flooring Association (NWFA) and trusted by installers under vinyl, SPC, laminate, and engineered wood flooring.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eClass 1 Protection Over Concrete\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eConcrete is never fully dry. Moisture vapor migrating up through the slab is the leading cause of cupping, warping, and adhesive failure in floating floors — and the most common warranty exclusion. At 6 mil, Moisture Barricade meets Class 1 vapor barrier requirements above, on, and below grade, satisfying the moisture protection most flooring manufacturers require over concrete.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eSealed Seams, Built In\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eEach roll features an integrated adhesive strip that joins sheets edge to edge, sealing the seams without separate tape. Roll it out, overlap, press, done — a continuous moisture barrier across the whole slab in minutes.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eThe Layer That Works With Everything\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eMoisture Barricade is the universal add-on: pair it with any standard foam underlayment for a second line of moisture defense, or use it solo under flooring that already has a pre-attached pad — including SPC and WPC rigid core planks over concrete, where added foam isn't allowed but moisture protection still is. If your floor has the cushion built in, this is the moisture layer it's missing.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eBig Coverage, Small Price\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eOne roll unfolds to 12' x 25' — 300 square feet of protection — so most rooms are covered with a single roll and a basement or whole condo with two or three. It cuts with a utility knife, weighs next to nothing, and costs a fraction of what slab moisture damage does.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhere it works best:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eUnder floating SPC\/WPC vinyl plank over concrete slabs\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eUnder laminate and engineered wood — with underlayment or pre-attached pad\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBasements and on\/below-grade concrete\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eAs an extra moisture layer beneath any standard underlayment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eGood to know:\u003c\/strong\u003e This is a moisture barrier only — it adds no cushion or sound reduction. Pair it with the underlayment your floor type calls for.\u003c\/p\u003e","brand":"BuildDirect","offers":[{"title":"12' X 25'","offer_id":50005360673065,"sku":"fp000009","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0744\/4289\/9753\/files\/fp000009.jpg?v=1743198099"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0744\/4289\/9753\/collections\/collectionBanner-VinylFlooring-Underlayment-1.jpg?v=1691688106","url":"https:\/\/www.builddirect.com\/fr\/collections\/underlayment.oembed?page=4","provider":"BuildDirect","version":"1.0","type":"link"}