When wavy spots happen along the lower edge of a layer the layer can pull up and away from the layer underneath.
Roll roofing cracked.
Place a sheet of 36 inch roll roofing directly over the 18 inch roofing that is covering the valley.
Rolled roofing usually expands and contracts with temperature changes as the building settles and the roof ages.
If you re doing this in the winter roll your roofing sheets out in a garage.
If the job must be done anyway store the rolls in a warm place prior to application or unroll and cut them into strips no longer than 18 feet and let them lie on the roof until they are flat.
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If it does have to be installed in cold weather cut it into 12 to 18 foot sheets and lay them flat inside a garage to warm up and flatten out.
Coverage white fiberglass mineral surfaced cap roll roofing.
This is most often caused by aging.
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Owens corning deckseal sa sbs cap 39 375 ft w x 32 833 ft l 100 sq ft shasta white roll roofing.
Place bricks in the corner to keep it down and reduce resistance later.
As a rule because roll roofing can crack in cold weather it should not be applied when the temperature is below 45 f.
Roll roofing is not very pliant or flexible in cold weather of fewer than 45 degrees fahrenheit and it can crack and break if it is manipulated while cold.
Ultraviolet light from the sun boils the volatiles out of the asphalt and the asphalt becomes brittle and unable to withstand the shrinkage and expansion forces induced by temperature changes.
Roll out the roofing sheets and lay them flat on the ground.
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Extend the layer several inches beyond each end of a crack.
As this happens the different layers become wavy or blisters can develop and crack open.
Apply a uniform layer of roof mastic along a crack using a wooden applicator or a paint stick.
Cold weather damages roofing sheets.
Cracks in roll roofing are usually the result of shrinkage.
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