Flat Roof Minimum U Value

Floor 0 25 w m2 k.

Flat roof minimum u value.

You should of course see the manufacturer provided technical data sheet for the r value of specific products. 0 071 6 fiberglass insulation. 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. 0 027 wood roof.

0 11 4 fiberglass insulation. R value of various materials. For a very good introductory overview article on r value see r values over at the website of. Flat metal roof.

U value of a flat roof. 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. Pitched roof sloping ceilings. 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.

0 05 8 fiberglass insulation. 0 48 1 fiberglass insulation. Insulation for walls including cavity walls solid walls and timber or steel framed walls. All new projects must prove themselves to be reasonably energy efficient.

Insulation for flat roofs pitched roofs and balconies and terraces. 0 039 12 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. 0 90 1 fiberglass insulation.

0 16 3 fiberglass insulation. Get a u value calculation from our free online u value calculator or our technical department. Roofs 0 20 w m2 k. Ground floor no underfloor heating 0 18w m k.

Walls 0 30 w m2 k. 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. However in new builds u values are part of the overall goal for energy efficiency. Cold roof ceiling level 0 16w m k.

Ground floor underfloor heating 0 15w m k. 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. 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. A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value.

Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.