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