Modified Bitumen Roof Blisters
Determine the extent of the damage.
Modified bitumen roof blisters. It contains a base sheet with no granule and a cap sheet with granule protection. Bitumen roof if the membrane is in good condition your contractor can simply cut an x shape into the blister to access the layer underneath. To make bitumen tougher and more elastic a synthetic polymer is usually added. These reinforced rolled sheets can be adhered by.
Liquid applied coatings should be installed per the manufacturer s instructions which may include a waiting period. Using hot asphalt fused by torching the sheets together or cold applied using adhesives or peel stick. Blisters typically develop from lamination voids within the system or product. They typically are installed as a one two or three ply roof system.
Repair of blisters on modified systems in general blisters that are keeping air in will keep water out. Blisters in a modified bitumen roof. The most common problems include. A pocket of air trapped between the layers of a roof membrane between the components of a roof assembly or within a layered roofing product such as an asphalt shingle.
The big issue with repairing a modified bitumen roof surface is the question of whether moisture has made its way into the asphalt layer and if so how much. Repairing a rooftop with modified bitumen coating. Either embed aggregate in hot bitumen or roof cement or apply a surface coating compatible with the existing surfacing. Roofing membranes for low slope application are generally asphalt or polymer based 1 bitumen has been used as a roof water proofing agent for many years.
All blisters originate with the formation of a void or unadhered area in the mopping bitumen either between the felt plies or between the substrate and the membrane. Modified bitumen roofs are a cross between built up and single ply systems. Modified bitumen roof system is a two ply application waterproofing system. The membrane consists of a multi layer sheet of asphalt with polyester or fiberglass reinforcements and plastic or rubber modifiers.
It s necessary to inspect the modified bitumen roof. Modified bituminous sheets are made by combining. All conventional low slope roof systems can experience blisters in some form. The resulting mixture is called modified bitumen.