Floor 0 25 w m2 k.
Flat roof minimum u value.
The below drawing shows the u value requirements set out for new properties in the building regulations for each element walls floors and roofs.
0 039 12 fiberglass insulation.
You should of course see the manufacturer provided technical data sheet for the r value of specific products.
Get a u value calculation from our free online u value calculator or our technical department.
All new projects must prove themselves to be reasonably energy efficient.
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 26 2 fiberglass insulation.
Ground floor underfloor heating 0 15w m k.
Ground floor no underfloor heating 0 18w m k.
R value of various materials.
0 48 1 fiberglass insulation.
Insulation for flat roofs pitched roofs and balconies and terraces.
Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.
For a very good introductory overview article on r value see r values over at the website of.
A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value.
0 11 4 fiberglass insulation.
0 071 6 fiberglass insulation.
Pitched roof sloping ceilings.
U value of a flat roof.
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.
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.
The current legal limits under building regulations part l are as follows.
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.
0 05 8 fiberglass insulation.
Insulation for walls including cavity walls solid walls and timber or steel framed walls.
Roofs 0 20 w m2 k.
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.
Cold roof ceiling level 0 16w m k.
0 90 1 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.
Flat metal roof.
