Description
The underlayment lies flat under the roofing materials. It has water-resistant properties. The role of the underlayment is to provide additional protection from the elements, particularly water. In case your shingles suffer some damage, your home will remain protected from water intrusion as long as the underlayment is intact. In case of a storm, even if your shingles are blown away, the underlayment will still serve as your home’s defense against the wind and rain until your roofer can make the necessary repairs or replacement.
The most common underlayment materials are rubberized asphalt, non-bitumen synthetic, and asphalt-saturated.
Specification
| item |
index |
| Vulcanized rubber FL |
Non-Vulcanized |
Resinous |
| Tensile strength at break /(N/cm) |
Normal temperature(23℃)≥ |
80 |
60 |
100 |
| High temperature(60℃)≥ |
30 |
20 |
40 |
| Elongation at break / % |
Normal temperature(23℃)≥ |
300 |
250 |
150 |
| Low temperature(-23℃)≥ |
150 |
50 |
- |
| Peel strength/N ≥ |
40 |
20 |
20 |
| Watertight (0.3Mpa. 30min) |
No leakage |
No leakage |
leakage |
| Fold ability at low temperature |
-35℃ No crack |
-35℃ No crack |
-35℃ No crack |
| Heat elongation and shrinkage/mm |
Elongation≤ |
2 |
2 |
2 |
| Shrinkage≤ |
4 |
4 |
4 |
| Air aging(80℃*168h) |
Retention of tensile strength at break %≥ |
80 |
80 |
80 |
| Elongation retention at break %≥ |
70 |
70 |
70 |
Feature
1. Creates a Moisture Barrier
Wind-driven snow and rain can trap water under your shingles, exposing your roof deck and the interior of your home to moisture damage, leaks, mold, and rot. Underlayment provides an additional layer of protection that your shingles just can’t offer.
2. Provides Extra Protection
Your shingles are your roof’s first line of defense against wind, UV rays, and water penetration. Since shingles overlap, they’re prone to lift when hit by strong winds, making them vulnerable to blow-off and water intrusion.
If a major storm breaks your shingles loose, you can count on underlayment to keep snow, ice, and rain from penetrating the roof deck and entering your home.
3. Protection from Ice & Snow
If you live in a snowy climate, your roof is at risk of forming ice dams. Ice dams typically happen when warm air hits the roof deck and causes snow to melt. If melted snow runs down your roof, it can refreeze over your roof’s perimeter and form ice dams.
When snow or ice on your roof melts, the water can seep into any openings in the ceiling, causing leaks, water damage, and mold. The water-resistant underlayment will seal around the frame and ensure the water drains off the roof.
Application
1. Moisture Barrier: Synthetic underlayment acts as a moisture barrier, preventing water infiltration into the roof deck during installation or in case of a roofing failure.
2. Waterproofing: It provides an additional waterproofing layer, protecting the roof deck and the interior of the building from water damage.roofing failure.
3. UV Protection: Some synthetic underlayments are designed to resist UV exposure, protecting the roof deck and the underlying structure from sun damage.
4. UV Protection: Some synthetic underlayments are designed to resist UV exposure, protecting the roof deck and the underlying structure from sun damage.
5. UV Protection: Some synthetic underlayments are designed to resist UV exposure, protecting the roof deck and the underlying structure from sun damage.
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