This roof has an obvious leak in the porch area due to poor installation techniques. FW&D was called in to make an assessment and recommend a solution. We proposed to use Certainteed WinterGuard™ waterproofing shingle underlayment as the solution for winning the battle against water penetration in this roof's most vulnerable place, the valley. But we decided to go for maximum protection and covered the entire porch roof area. WinterGuard™ is a composite material of asphalt polymers, formed into a rolled sheet. The asphalt makes it vapor-tight, and the polymers make the asphalt elastic and sticky. This protective
barrier is able to stretch and seal around nails driven through it.
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