Insulating A Flat Roof With Parapets

Insulate within parapet wall cavity to depth of roof insulation if present.

Insulating a flat roof with parapets.

A warm roof is defined as being when the all or the majority of the insulation is above the joists or deck. The roof itself is therefore kept warm. The perimeter of the roof assembly insulation is wrapped to prevent interstitial airflow from the parapet into the multilayered rigid insulation of the field of the roof. Then sheathe the deck right up to the parapet studs.

Max baker and stonewall jackson would be proud. For areas which do not need above cover hole with bug screen. Naturally there are many different types of parapets for all the different situations materials construction methods and climates out there. The cure for parapetitus is continuity of the control layers and letting things move when they have to move.

As with any building element when designing a flat roof it is good design practice to follow and adopt relevant design guidance. Figure 5 ballasted inverted roof insulation over internal gutter figure 6 ballasted inverted roof detail at eaves pg 5. Parapets on modern roofs. Probably 1000 all put together for an r 49 roof in a 2x6 frame roof.

Parapets often go unnoticed on modern houses as they can appear as the line of a flat roof. Screw it down and glue down a 45 mil epdm membrane. Terminate roofing on parapet wall with mechanically fastened termination bar. The decks have been designed with parapets.

Parapets can be both a safety feature designed to stop falls from the edge of the roof and also a constructional and stylistic feature a large percentage of flat roofs also feature a parapet of some height. Soooo then install the same perimeter wood blocking right over the roll roofing to match insulation thickness 5 or so of polyiso. The build is by mbc timber frame and it will be a cold roof construction. Upstands at parapets and abutments should be protected by either.

Roof membrane must lap up wall to minimum of 12 above roof plane or per specifications whichever is greater. We also have a parapet on a flat roof and the ventilation solution is not through the cladding but the design flows air over the parapet. I would switch to a warm roof insulation above the structural elements. The parapet contains the sloped roof and frees up the architecture to have a perfectly flat profile.