Whether you are installing 3-tab shingles on a new garage or need to fix a leaking section of your roof, avoid these four common DIY roofing mistakes.
Not Using the Shingle Manufacturer's Nailing Instructions
All shingle manufacturers print instructions on their packaging that explains exactly how many nails to use on each 3-tab strip and where to nail them in. If you do not follow these instructions to the letter, then the roof will leak more quickly and will have a shorter useful life before it needs replacement.
Installing 3-Tab Asphalt Shingles on a Flat Roof
While 3-tab shingles are appropriate for homes and garages in many areas of the country, they are not appropriate for installation on to a flat roof. Roofs without enough pitch will pool water and this will lead to an early need for replacement of your roof. Instead of installing this type of roofing for a flat roof or one with a low pitch, opt for a polymer or asphalt roof designed for this type of roof structure.
Placing Nails Too Close to the Boot Edge on Pipe Flashing
One mistake many people often make is to nail pipe flashings too close to the boot edge. When you nail too close to the edge, the boot will age in the sun and crack and the pipe flashing will come loose and cause your roof to leak. To avoid this problem, you should always nail at least a couple inches up from the edge of the boot. Additionally, you may want to use specialized gasket screws that will not back out from your roof as it ages and will hold the pipe flashing securely in place.
Sealing Pipe and Chimney Flashing with Caulking Instead of Sealant
When you are purchasing the supplies necessary to fix your roof or to install 3-tab asphalt shingles on your new shed or garage, you need to purchase both a tube of silicone caulking as well as a tube of roofing sealant. Although many people use these two things interchangeably, they are two completely different products with two completely different applications.
Silicone caulking is used simply to prevent water from intruding behind the roof's flashing, while roofing adhesive is a strong glue you should use under each piece of flashing or any replacement shingles you install. The adhesive will keep the new flashing or shingles in place and help prevent future leaks. Go to sites about shingle roof repair to learn more.