When planning your roof replacement, your roofing contractor may inform you that your roof will need re-sheeting. In this blog, roofing and stucco repair contractor Enchantment Roofing discusses what roof re-sheeting is and why your roof might need it.
The roofing substrate or decking is the roofing layer where the waterproofing barrier and roofing materials are nailed to. You’re probably already familiar with the plywood or oriented strand board (OSB) that’s used in today’s roofs. If your home was built before 1970, it probably has a different type of substrate.
Shiplap is made from fir wood planks and was the standard substrate material since the 1940s. These boards are attached to the trusses, over which the waterproofing barrier and asphalt shingles are installed. Half-inch thick plywood has since overtaken shiplap as the substrate material of choice.
Contractors like us who offer roofing and exterior home remodeling services recommend resheeting when, upon inspection, we find out that the roofing substrate is made of shiplap. This dates the roof as close to 50 years old. The resin in wood that old would have dissipated, making the substrate brittle, which wouldn’t be able to support the new roof. The planks would also have large gaps between them by this time due to thermal expansion and contraction.
If your roofing contractor is telling you that your needs to be re-sheeted, this means that all the shiplap will have to be removed and replaced with standard plywood or OSB decking. And that’s under the assumption that the roofing structure itself is in good, sound condition. If the timbers that make up the roof structure is in the same state, this means the entire roof will have to be rebuilt.
Why Re-Sheet the Roof?
Re-sheeting will, of course, raise the cost of roof replacement. But you should look at it as a type of structural repair; a fragile roof structure isn’t likely to last. Keeping the original shiplap substrate will limit your choice of roofing options, as most roofing manufacturers have minimum requirements on the type of substrates their products can be installed on.
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