Fixing Rigid Insulation To Roof

The quest for greater energy efficiency in buildings has led to increasing interest and need for insulation improvements in hvac equipment more airtight construction new materials and assemblies.

Fixing rigid insulation to roof.

The fasteners have a twin start spiral shank welded to a button head and are designed to secure plywood topped composite insulation boards to timber roofing rafters. For example the national roofing contractors association nrca recommends using rigid insulation boards that are 2 x4 to reduce stress on roof membranes. Foamular xps roof insulation for commercial buildings page 5 foamular xps roof insulation for commercial buildings foamular xps insulation is a rigid foam insulation which meets the needs of today s design professionals for a truly sustainable insulation product. The plywood was fastened through the rigid foam to the rafters with long screws.

Fixing flat roof insulation is quick and easy with insofast isf18 fixings. This type of insulated roof assembly limits thermal bridging through rafters. When hammer driven the fastener corkscrews into timber and masonry materials to deliver a mechanical fix that grips both the wood batten on one side of the insulation and the brick wall on the other side. After the roof deck is prepared the rigid foam boards need to be cut to size to fit snugly together on.

Owens corning insulation products help improve thermal performance and control moisture in commercial institutional and. Rigid foam insulation installation prepare roof deck. These one piece hammer in fixings are part of a range of insulation anchors manufactured by thor helical. The airtwist fastener is a one piece fixing with a 7mm diameter two start helix.

Styrofoam extruded polystyrene foam insulation sheathings such as styrofoam cavitymate or styrofoam ultra sl insulation provide a coat of continuous insulation over the stud members when properly installed and are treated with durable joint treatments such as great stuff pro gaps cracks or liquidarmor flashing and sealant as an integrated air and water barrier system. Attach to deck board. Lstiburek does a great job explaining why rigid foam insulation expands and contracts in his correction to foam shrinks and other lessons. By martin holladay april 3 2015.

Another thing to consider is to apply a dab of silicone caulking on top of every nail you use to secure the rigid foam insulation panels. This will help even more to avoid the transfer of moisture into the roof. Use 1 1 2 inch galvanized decking screws in all four corners on the sides in the middle and along the bottom if you re working near the eaves. Fixing insulation between battens does not form a continuous and airtight insulation layer.

The bottom layer of a single ply membrane roofing system is the roof deck or substrate. Senior engineer manager at icynene john broniek makes the case for the unvented attic assembly and why insulating the underside of the roof makes sense.