Over Deck Roof Insulation

Concrete contains a significant amount of moisture and there is no test to accurately tell if the concrete is dry enough to install the roof on top of it.

Over deck roof insulation.

For heat protection a cover board typically gypsum board must be adhered or mechanically fastened over the polystyrene roof insulation. Flat roofs are more susceptible to leaking than pitched roofs. The solid substrate for fluted metal decks is typically a gypsum underlayment and the concrete is the solid substrate for concrete decks. Bluish green foam insulation as over deck insulation and exterior wall insulation form a protective layer over the whole building.

The fully adhered membrane wrapped down over the cut back roof deck to tie into the wall water control layer and air control layer photograph 11. Allows for installations directly over a wide flute or metal deck application for spans up to 2 and resists damage from construction and maintenance. Calculate the total square footage of the roof to determine the number of. An excellent fire barrier densdeck roof boards feature a noncombustible core and inorganic surface that offer greater fire protection than other conventional commercial roofing products when applied over combustible roof decks and steel decks.

If you are tying the roof directly to a house wall you can install a ledger board with flashing and install rafter ties to attach the rafters at the appropriate angles or use engineered trusses. Materials appropriate for insulating sheathing with unvented cladding substrate include. Can be used as a cover board in re roofing and new construction proven to reduce the tendency for blistering in hot asphalt applications. One of the keys to over roofing is to tie the air control layer of the roof assembly to the air control layer of the wall assembly.

The over deck insulation covers the roof and the columns from getting heated up and the wall insulation prevents the walls to be heated up. The insulation installed over the roof deck must be installed in multiple layers with joints offset in order to control convective looping at joints between insulation panels. The right thickness would need to be calculated to move the dew point above the plywood deck where air infiltration is minimized. Thermapink roof insulation can be used with bur or modifi ed bitumen systems.

Add insulation above the roof deck this approach fits current building science thinking in terms of putting the thermal control layer on the outside of the building structure. On the gable ends this was pretty easy. On the front of the roof edges the original roof deck sheathing was cut back flush with the wall and the fully adhered membrane folded down around the rafter tails to catch the. Shed roofs project as a single plane roof pitched away from the house.

Measure the roof with a tape measure. Roofs over concrete decks should always have a vapor barrier installed. Typically this would be achieved by adding polyiso insulation above the plywood deck. It protects the building from any kind of heat ingress.

Like fully adhered insulation fully adhered vapor barriers need a solid substrate below. Densdeck roof boards are fm tested and approved as the only 1 2 gypsum product to meet the. Insert the pry bar. Remove all existing flashing material from around vents and pipes using a pry bar and hammer.