The main reason the following six areas
 
1, the design temperature difference caused by the expansion deformation of the roof member thoughtless;
2, poor quality of construction or insulation thickness is not enough;
3, leveling layer caused severe cracking and other structural layer waterproof layer cracking;
4, the web of poor quality, aging or to produce cold brittle at low temperatures;
5, and mastic asphalt (SMA) brewed temperature is too high, too long, resulting in decreased flexibility;
6, the structure of uneven foundation settlement, cracking lead roofing.

Roll Roofing after cracking action
 1, for the primary uncracked irregular cracks, usually in the cracking of the subsidy to the web.
2, there are rules for cracks, because of its a number of years after the completion of the roof is in the occurrence and development stage, only the year before being treated effectively. There are two ways to deal with: one is to use lid strip sew up the seam, the other is with waterproof grease fill joints.

Roofing membrane from the drum
1, between the membrane and the grass roots, or membrane localized bond between the layers is not dense at the water there.
2, between the membrane and the grass roots, or membrane between the layers bond is not strong, when the adhesive force is less than the water vapor pressure, the adhesive will be formed at the disengaging drum kits.

Outside management measures
After the roofing membrane from the dark, depending on the size of the bulge were adopted following a different approach.
1, 80mm below the drum kits, pumping oil filling approach may be eliminated.
2, 100mm around the drum kit, can be cross-cut method.
About 3,400 ~ 500mm drum kits or large drum kits, will have surgery using a large peeled methods.
4, when the entire roof with drums, a large empty area, the need to eradicate all of the web layer renovated redo waterproof layer.

Flowing roof
the reason
1, mastic (SMA) at the end of the heat.
2, mastic (SMA) adhesive layer is too thick, or too much talcum powder admixture.
3, large roof slope, and the Stones roll in a direction parallel to the ridge.
4, pisolite poor quality protective layer.

Outside management measures
--- After treatment for minor roof flowing flowing as long as watertight, do not deal with. For waterproofing membrane flowing serious need to re-paving. For medium flow process may take the following measures:
1, cutting method;
2, local eradicate resurfacing method;
3, full shovel resurfacing method.

Waterproof layer aging
the reason
1, weather conditions.
2, asphalt cements heat is too high.
3, asphalt cements brewed quality.
4, retaining surface quality.

Actions
1, mild local aging waterproof layer, can be partially repaired eradicate new shop, then brushing a layer of asphalt on the entire roof waterproof layer, sprinkle green beans make up the sand.
2, severe to eradicate aging into the film surface, paving a new surface. If green beans sprinkled sand surface protection layer, asphalt cement material thickness 2 ~ 4mm, diameter 3 ~ 5mm sprinkle shop without angular mung bean sand, wash clean the shop front was heated to 80 ℃, hot with a light sprinkle shop Swinger Gunzi compaction.
3, preferably converted asphalt concrete surface layer can be 1: 1 mix ratio gravel (stone diameter 3 ~ 5mm), to be brewed 170 ℃ dehydration asphalt 10%, heat fry mix is ​​maintained at 180 ℃ Serve about 12 ~ 14min; linoleum laid on the surface layer, the virtual shop 15mm thick, 10mm thick compacted to beat with an iron ironing surface oil can be deposited.

Waterproof structure node mishandling
the reason
1, gables, parapets and chimneys protruding roof, risers and wall waterproofing layer at the intersection of leakage. Either because of the vertical roll roofing membrane is not well layered lap; or shut at the web so that rain water into the cracks at the crack; or the web is not made at the corner of the arc-shaped, obtuse; bad or parapet and top quality pressure and cracking; drip line or not done or not done.
2, the reason or leaking gutter Gutter length is too large, longitudinal slope is too small; or less gullies, downspouts small diameter, resulting in poor drainage; or water bucket, gutter around the web Fastened; or due to rain mouth Pelton installed too high, so that rain water flows into the interior along the outside of the water bucket.
3, roofing Deformation improper handling, such as iron cover mounted securely, improper flashing height or slope, roll closure lax.
4, cornice, cornice leaking, due to the cornice mortar not suppress membrane, membrane seal mouth, eaves and mortar cracking under the mouth do not drip line.
Actions
1, when the parapet capping cracking, cracking can eradicate capping mortar, heavy wipe 1: 2 or 1:25 cement mortar, and make the drip line; can be replaced by prefabricated reinforced concrete roof when the pressure conditions.
2, highlighting the roof chimneys, gables, risers and roof junction, corner made obtuse angle, vertical and roof membrane should be layered lap; have been leaking site, you can roll the corner of leaks wood cut and dried membrane peeling the old hierarchical, remove the old mastic (SMA).
3, leaking cornice, cornice can be set off at the old coil, galvanized iron nail on the cornice, the new web affixed to metal.
4, mouth leaking rainwater seepage, water bucket four weeks can eradicate the web, check whether the short tube close to the grass-roots board or iron plate. Such as short tube resting on floating screed, then you chisel out screed, installed after clearing a good short tube, and then redo the law lap three felt four oil and water repellent layer, the following additional layer to the web and a layer of recycled rubber linoleum, above the junction with the water bucket to use mastic asphalt (SMA) or ointment caulking.