Roofing Over An Existing Roof: What You Need To Know ...

Published Jun 26, 20
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10 Inspirational Graphics About roof Preparation Before Installing Roof Shingles

When the shingles are being applied, lay them over the valley flashing, cut completions to the chalk line and nail the shingles a minimum of 50 mm (2) back from the chalk line. Cut a 50 mm (2) triangle off the top corner to direct water into the valley and embed the valley end of each shingle into a 75 mm (3) band of asphalt plastic cement.

Install metal flashings where shingles meet walls or chimneys, too. Ice and water protector membranes work well to flash and assist secure around skylights, dormers, turbines and other difficult roofing system areas. Apply flashing products in show with the shingle setup treatment, with both the flashing and the shingles arranged to work together to safeguard around the joint areas - asphalt roof shingles.

When using the brand-new shingles, each shingle course will be covered by an action flashing. Metal Action Flashing Pieces There are 2 simple rules to follow: Each flashing should overlap the one below by at least 75 mm (3 ), however not be noticeable below the shingle top lap. Insert each step flashing in a 75 mm (3) broad application of asphaltic plastic cement, and nail in location.

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The metal action flashing pieces are rectangular in shape and style, roughly 250 mm (10) long and at least 50 mm (2) broader than the face of the shingle being used. For instance, when utilizing metal flashing with shingles with a common 143 mm (5 5/8) direct exposure (such as traditional 3-tab shingles), the size of the flashing will be 250 mm x 200 mm (10 x 8).

Keep in mind: Other step flashing sizes are also appropriate. For IKO's Cambridge shingle, with its bigger 5 7/8 exposure, a 10 x 8 flashing piece is still ideal, given that the 8 measurement is still at least 2 larger than the shingle's direct exposure dimension. However, when flashing Crowne Slate, with its much bigger 10 direct exposure, the flashing piece would require to be 10 x 12.

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Position it so the tab of the end shingle covers it entirely. Secure the horizontal flange to the roof deck utilizing two nails. Do not fasten the flashing piece to the vertical wall. This will enable the flashing piece to move individually of any differential growth and contraction that might happen in between the roof deck and the wall.

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Ensure that the tab of the shingle in the second course will cover it entirely. Secure the horizontal flange to the roofing. The second and being successful courses will follow with the end shingles flashed as in preceding courses. Once everything that goes below the shingles has actually been correctly prepared and installed, it's lastly time to discover how to shingle a roofing.

Initially before you lay the field shingles (" field" referring to the large expanse of roofing within the borders of eaves, ridge and rakes) it is necessary to install a preparatory course of starter shingles which are particularly manufactured for that function. But, even if you style your own on-site by cutting basic shingles to size, both serve important functions at the roof's eave.

Professional specialists typically recommend and utilize starter strips along rake edges in order to yield a straight edge from which all the field courses can begin. In addition, these starter strips enhance the roofing system's wind-resistance at the rake. It's vital to follow the producer's instructions for the particular roofing system shingle due to the fact that not all shingles have the very same exposure (the part of the shingle that's visible as soon as set up), offset (the lateral distance between joints in successive courses sometimes called 'stagger' or 'edge-to-edge spacing') and/or nail positioning.

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You must position nails in the correct place and drive them flush with, however not cutting into, the shingle. Nailing the shingles properly is critical to the roofing system's wind-resistance. Correct nail placement is likewise a requirement for the shingles' minimal service warranty coverage. If you've picked closed valleys, they are finished as shingle courses approach and go through the valley. replacing shingles.



As shingles are installed on the adjacent roofing area, completion of each course of shingles is cut (cut) 2 back of the valley centerline. You've nailed in the last field shingle and you can see the goal from here. Well done! In this case, the surface line is the hip and ridge capping. house shingles.

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Instead, private ridge cap shingles are used to straddle the ridge and shed thin down either slope. There are different ridge cap shingles available on the market but, as soon as again, the treatment for installing them is based upon the exact same basic principle of overlapping. For hips, start at the bottom and work upslope.

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