Cold Deck Flat Roof U Value

For more information see our articles and how to videos below. Ground bearing slab 0 16w m2k with 100 thick insulation p a 1 15. The epdm rubber roof membrane is then installed using the contact adhesive onto the deck.

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Providing you with instant calculations all day everyday with step by step options and hints and tips along the way the no jargon u value calculator takes you through your construction build up until each element is included.

Cold deck flat roof u value.

Flat roof u value 0 18 w m2k 2 warm deck flat roof the type of insulation for this is usually of a rigid type and the thickness will vary depending on the manufacturer s specifications. The easiest way of getting a u value calculation is by using our free online u value calculator. The 18mm roof grade deck is then fixed on top of the rafters leaving suitable air flow between the insulation and the deck. Reference table for u values u value is the coefficient of transmission i e the transmission of heat through the materials which compose the building s envelope or outer shell.

The new build u insulation values have been taken from manufactures catalogues. These can be supported with a detailed report. This is known as a cold roof because the roof deck and roof space are close to the external air temperature. Cold deck flat roof 0 18w m2k new double glazed 12mm gap 1 80w m2k cold deck flat roof 0 58w m2k existing bathroom with 75mm rockwool new build u values.

U value of a flat roof. Ecotherm s u value calculator is simple to use easy to tweak and provides an instant u value. To comply with part l of the building regulations 2010 all roofs to rooms except those in unheated buildings should be thermally insulated to a maximum u value of of 0 18 w m k. A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value.

For example a building with material with an r value of r 11 converts to an u value of 0 09 1 r or 1 11 0 09. Thickness varies according to the manufacturer s specifications. U value has an inverse relationship to r value. We provide u value calculations to show compliance with current building regulations standards and best practice.

This is placed over the roof joists and a board normally external ply is laid on top.