{"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","url":"https:\/\/www.builddirect.com\/fr\/products\/fanfold-underlayment","provider":"BuildDirect","version":"1.0","type":"link"}