Built-Up Roofing

Built Up-Roofing (BUR) is commonly used on low sloped roofs. It consists of plies of felts that are layered using asphalt, coal tar pitch, or cold applied adhesive. Rolled cap sheet or aggregates are common to layer over to protect the plies from the UV ray and creates a finished membrane.

There are different types of BUR, such as hot process and cold process. We specialize in installing cold process systems. We do like to install these types of roofs in the summer for the cold process adhesive has to cure in order to be waterproof. Each layer of felt needs to be open and allowed to cure for 48 hours.

A cold process system consists of 4 layers. The first layer is a nail down base sheet. Unlike the other layers, nail down base sheets do not have to cure for 48 hours, as this is simply a base sheet to start your water proofing plies. The mext two layers will be base sheets rolled over cold process lap cement and will need 48 hours to cure. Finally, the 4th layer is a cap sheet also rolled over lap cement, and similarly will also need 48 hours to cure in order to be fully waterproof and allow your roof to be ready for the rain.

There are other options we provide for a waterproofing membrane that dont need a 48 hour cure time. TPO or modified bitumen can be installed and not need time to cure because these membranes are heat welded.