---
product_id: 406162274
title: "FT Synthetics Platinum HT-B Self-Adhering Roofing Underlayment, 41 mil, High-Temp Ice & Water Shield, 100% Butyl, Nail Sealable, UV Resistant, ASTM Certified, Lifetime Warranty (36\" x 67')"
brand: "ft synthetics"
price: "€ 561.83"
currency: EUR
in_stock: true
reviews_count: 8
category: "Ft Synthetics"
url: https://www.desertcart.it/products/406162274-ft-synthetics-platinum-ht-b-self-adhering-roofing-underlayment-41
store_origin: IT
region: Italy
---

# 41 mil ultra-thick durability 180-day UV resistance Nail-sealable per ASTM D1970 FT Synthetics Platinum HT-B Self-Adhering Roofing Underlayment, 41 mil, High-Temp Ice & Water Shield, 100% Butyl, Nail Sealable, UV Resistant, ASTM Certified, Lifetime Warranty (36" x 67')

**Brand:** ft synthetics
**Price:** € 561.83
**Availability:** ✅ In Stock

## Summary

> 🏆 Elevate your roofing game with Platinum HT-B — the ultimate underlayment pros trust!

## Quick Answers

- **What is this?** FT Synthetics Platinum HT-B Self-Adhering Roofing Underlayment, 41 mil, High-Temp Ice & Water Shield, 100% Butyl, Nail Sealable, UV Resistant, ASTM Certified, Lifetime Warranty (36" x 67') by ft synthetics
- **How much does it cost?** € 561.83 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/406162274-ft-synthetics-platinum-ht-b-self-adhering-roofing-underlayment-41)

## Best For

- ft synthetics enthusiasts

## Why This Product

- Trusted ft synthetics brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Limited lifetime warranty with 18+ months shelf life means peace of mind on every project
- • **Slip-Resistant Safety:** Patented Gripsot anti-slip surface keeps your crew safe on every step
- • **Effortless Installation:** Split release silicone liner ensures quick, hassle-free application
- • **Versatile Compatibility:** Works seamlessly under metal, cedar shakes, concrete, asphalt, and composite shingles
- • **Unmatched Weather Shield:** High-temp butyl adhesive bonds from 32°F to 265°F for year-round protection

## Overview

The Platinum HT-B Self-Adhering Roofing Underlayment is a premium 41 mil thick, high-temperature waterproof membrane featuring 100% butyl adhesive for superior bonding and nail sealability. Engineered with patented anti-slip technology and UV resistance up to 180 days, it offers unmatched durability and ease of installation under a wide range of roofing materials. Backed by a limited lifetime warranty, it’s designed to protect and perform in extreme weather conditions, making it the go-to choice for professional roofing projects.

## Description

The FT Synthetics Platinum HT Self-Adhering Underlayment is an all-new, updated underlayment from the original FT Synthetics HTSA Platinum HT Self-Adhering Underlayment. Its upgraded features include it being a high-temperature self-adhered waterproofing membrane that features a black butyl rubber adhesive that is designed to be used as a secondary ice and water protection for steep slope roofing applications. It can be used under most roofing materials such as residential or commercial metal, primed cedar shakes, mechanically attached concrete, asphalt shingle, or composite shingles. Combined with Gripsot technology, the underlayment has a patented anti-slip walking surface with high-temperature black butyl adhesive backing that allows for both low temperature (down to 32 degrees Fahrenheit) and rising deck adhesion and high-temperature stability (up to 265 degrees Fahrenheit). Backed by its limited lifetime warranty, the FT Synthetics high-temperature underlayment has a split release silicone liner for easy removal during installation.

Review: Great underlayment - Best underlayment I’ve dealt with. Not slippery when wet. Holds up to extreme weather while you wait for roofing. Sticks tenaciously to the roof deck, and itself. Used it on my personal house.
Review: Great stuff. - Just finally getting the roof structure done and this stuff is the icing on the cake. Goes down easy and will protect until I can get the standing seam on. Stuck no problems in the 45° weather we had today. Buy it!

## Features

- 100% butyl provides bond to plywood or OSB roof decks
- Compatible with low slope roofing materials such as EPDM and TPO
- Nail sealable (meets and exceeds ASTM D1970)
- Watertight laps
- Shelf life of 18+ months
- Split release silicone liner
- 180 day UV resistance & Limited Lifetime Warranty

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09JQCCPML |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #214,950 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #73 in Flooring Underlayments |
| Color | Blue |
| Customer Reviews | 4.4 4.4 out of 5 stars (24) |
| Date First Available | October 18, 2021 |
| Item Package Quantity | 1 |
| Item Weight | 37.8 pounds |
| Item model number | 963000 |
| Manufacturer | FT Synthetics |
| Part Number | FTHTBSA |
| Product Dimensions | 7 x 7 x 48 inches |
| Shape | Roll |
| Thickness | 41 Millimeters |

## Images

![FT Synthetics Platinum HT-B Self-Adhering Roofing Underlayment, 41 mil, High-Temp Ice & Water Shield, 100% Butyl, Nail Sealable, UV Resistant, ASTM Certified, Lifetime Warranty (36" x 67') - Image 1](https://m.media-amazon.com/images/I/61XjdMjRDUL.jpg)

## Available Options

This product comes in different **Item Package Quantity** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great underlayment
*by J***0 on December 26, 2025*

Best underlayment I’ve dealt with. Not slippery when wet. Holds up to extreme weather while you wait for roofing. Sticks tenaciously to the roof deck, and itself. Used it on my personal house.

### ⭐⭐⭐⭐⭐ Great stuff.
*by J***E on December 17, 2023*

Just finally getting the roof structure done and this stuff is the icing on the cake. Goes down easy and will protect until I can get the standing seam on. Stuck no problems in the 45° weather we had today. Buy it!

### ⭐⭐⭐⭐⭐ Good product
*by R***S on March 25, 2026*

It's real sticky.

## Frequently Bought Together

- FT Synthetics Platinum HT Butyl Self Adhering Underlayment (Single Roll)
- ZIP System Huber Flashing Tape | Self-Adhesive Flashing for Doors-Windows Rough Openings (3.75" x 30')

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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-05-08*