Flat Roof Minimum U Value

Flat metal roof. All new projects must prove themselves to be reasonably energy efficient. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.

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0 071 6 fiberglass insulation.

Flat roof minimum u value.

Ground floor underfloor heating 0 15w m k. State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1 2010 2 r 20 3 r 20 state local mo missouri 2012 iecc. However in new builds u values are part of the overall goal for energy efficiency. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value.

Insulation for walls including cavity walls solid walls and timber or steel framed walls. A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value. Roofs 0 20 w m2 k. 0 11 4 fiberglass insulation.

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. You should of course see the manufacturer provided technical data sheet for the r value of specific products. Pitched roof sloping ceilings. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces.

0 48 1 fiberglass insulation. The actual specification required for a compliant building and necessary building fabric u value targets may vary depending on the actual overall proposed specification and the outcome of the energy. U value of a flat roof. 0 16 3 fiberglass insulation.

0 26 2 fiberglass insulation. Cold roof ceiling level 0 16w m k. 0 05 8 fiberglass insulation. The below drawing shows the u value requirements set out for new properties in the building regulations for each element walls floors and roofs.

Get a u value calculation from our free online u value calculator or our technical department. 0 027 wood roof. Ground floor no underfloor heating 0 18w m k. Insulation for flat roofs pitched roofs and balconies and terraces.

Walls 0 30 w m2 k. 0 90 1 fiberglass insulation. A u value of 0 55 w m k is used for cavity insulation and 0 30 w m k for internal or external wall insulation. The current legal limits under building regulations part l are as follows.

Minimum r value state local al alabama 2015 alabama commercial energy code 2 r 25 3 r 25 state local ak alaska 2012 alaska building energy efficiency standard 7 r 35 8 r 35. 0 039 12 fiberglass insulation. R value of various materials. Floor 0 25 w m2 k.

For a very good introductory overview article on r value see r values over at the website of.