Causes of Steel Roof Leakage and Treatment Measures
A.Cracking of a coil roof
a.Cause
1. poor consideration of the effect of expansion and deformation of roofing elements caused by temperature difference during design.
2, poor construction quality or insufficient thickness of the insulation layer.
3, serious cracking of the leveling layer caused by cracking of the waterproofing layer and other construction layers.
4, poor quality coil material, aging or cold brittle at low temperatures.
5, asphalt and marsupial (SMA) boiling temperature is too high, too long, resulting in reduced flexibility;.
6, uneven settlement of the structural foundation, resulting in roofing waterproofing cracking.
b.Treatment measures
1, for the grass-roots level is not cracked irregular cracks, generally in the cracked subsidized coil can be.
2, for regular cracks, because it is in the roofing completion of a number of years after the occurrence and development stage, only year by year to deal with to be effective. There are two ways to deal with it: one is to cover the seam with a seam allowance, the other is to use waterproof grease to fill the seam.
B.Two roofing roll material bulging
a.Cause
1, between the coil and the grass-roots level, or the coil between the layers of local bonding is not dense with moisture.
2, between the coil and the grass-roots level, or between the layers of the coil bonding is not firm, when the bonding force is less than the water vapor pressure, it will make the bonding off the formation of bulge.
b.External measures
After the drum of the roofing coil, according to the size of the drum package are used in the following different ways.
1, 80mm below the bulge, can be used to eliminate the method of pumping and filling oil.
2, about 100mm bulge, can use the cross-cutting method.
3, about 400 ~ 500mm bulge or larger bulge, it is necessary to use a large open knife to remove the skin method.
4, when the entire roof drum, hollow area is large, it is necessary to remove all coil layer renovation, redo the waterproof layer.
C.Roof flow
a.Causes
1, the heat resistance of the marsupial (SMA) bottom.
2, marsupial (SMA) bonding layer is too thick, or too much talc admixture.
3, the roof slope, and coil in the direction of parallel ridge paving.
4, bean stone protective layer of poor quality.
b.External treatment measures
Roofing after the flow of treatment --- on minor flow as long as no leakage, may not deal with. For serious flow of coil waterproofing layer needs to be re-paved. The following measures can be used to deal with medium flow.
