Sub floor/ Ground floor

wexford12

Little help if i can ask for im getting the sub floor put in tomorrow they using 150mm reinforced concrete slab power floated with a 65mm kingspan tf70 and 150mm high perimeter insulation, on morarflex radon barrier, on a sand blinding, on layers of well compacted clause 804 screening and clean stone hardcore. my question is is that enough insulation and what is "150mm high perimeter insulation" I see they have the kingspan there ready to use but not sure if its enough thanks for the help

gman2k

65mm sounds light alright - do you have DEAP carried out on the design or a designer involved anywhere?

rok

We went for 100mm Thermafloor. Foundation insulation make up might depend on whether you're going for underfloor heating.

Some info here
http://www.boards.ie/vbulletin/showthread.php?t=2055399792
http://constructireland.ie/vb/showthread.php?p=4428

the diagrams here show the perimeter insulation, between the slab/radon barrier / inner leaf blockwork
http://www.quinn-therm.com/floorinsulation/beneath-slab.cfm
http://www.ballytherm.ie/floors/belowground.htm

premiercounty

wexford12 wrote: »

Little help if i can ask for im getting the sub floor put in tomorrow they using 150mm reinforced concrete slab power floated with a 65mm kingspan tf70 and 150mm high perimeter insulation, on morarflex radon barrier, on a sand blinding, on layers of well compacted clause 804 screening and clean stone hardcore. my question is is that enough insulation and what is "150mm high perimeter insulation" I see they have the kingspan there ready to use but not sure if its enough thanks for the help

I believe that this is insulation between the slab edge and the wall - usually 15mm - 20mm thickness, and 150mm high as that is the thickness of your slab. Also used to allow expansion of the floor methinks.

Poor Uncle Tom

premiercounty wrote: »

I believe that this is insulation between the slab edge and the wall - usually 15mm - 20mm thickness, and 150mm high as that is the thickness of your slab. Also used to allow expansion of the floor methinks.

Correct, it stops cold bridging and allows for expansion where underfloor heating is being used.

BTW I would not use less than 100mm insulation in the floor slab.

wexford12

thanks for the help guys we went for a double foil back foam and yes the 150mm is at the wall . We are finished the walls now waiting till new year for roof windows etc