Newbuilds - how much insulation are you putting in?

Meloh

What thicknesses of insulation are you putting in floors, walls, roofs? Have you made cavity walls wider than standard to accomodate insulation?
Is your house timber frame or block built?

We're about to start block build and just wondering how much insulation everyone is putting in and what u-values are you aiming for?

rosnacanee

125 mm xtratherm in the floor as have underfloor heating

80 mm xtratherm in the wall - need to decide this early as the cavity needs to be 40 mm bigger than the insulation. i.e. if you have a 100m cavity too late to put in 80 mm have to use 60mm. not much i the price about 750 euro.

havent deceided on the roof yet

Mike2006

I am not an expert by any means but I think that you have asked the wrong question.

You should look to achieve a certain u-value. i.e. 0.2 for walls and then look at what thickness of a particular type of insulation will achieve this.

The reason I say this is because different type of insulation will have different insulating properties so 100mm of type x might be as good as 150mm of type y....

Mike.

mr.wiggle

Hi, made our cavity 6 inches ( 150m) rather than 4 inches ( 100m), and used pumped bonded bead insulation. Not an expert by any means but only can say
that we haven't a cold room in the house ( just don't tell the wife i said that, as she claims the on-suite is freezing !!:D)

W.

Quazzie

Am using 150mm Extratherm/UF in the floor to achieve an overal U-Value of .12*

My wall make up will be:
100mm Outer Leaf
50mm Cavity
100mm Xtratherm/CW
215mm Inner Leaf
38mm Xtratherm/TL
U-value .15*

Excluding the 38mm XtrathermTL reduces it to .18 which I think is adequte for what most people need.

*All U-Values supplied by Xtratherm.

muffler

mr.wiggle wrote: »

that we haven't a cold room in the house ( just don't tell the wife i said that, as she claims the on-suite is freezing !!:D)

Dont worry, they all say that

Quazzie

muffler wrote: »

Dont worry, they all say that

Its when it feels cold in the bedroom you've really got to start listening :eek:

MicktheMan

Quazzie wrote: »

Am using 150mm Extratherm/UF in the floor to achieve an overal U-Value of 1.2*

*All U-Values supplied by Xtratherm.

1.2?

Quazzie

MicktheMan wrote: »

1.2?

Sorry, its meant to read 0.12

Editted now.

Wonky Knees

rear and side extension. 150 in the slab. Cavity Block not cavity wall! 50mm horizontal on internal wall followed by another 50mm vertical, then plaster board and plastered. Moisture membrane in there somewhere. Outside wall is rendered in most places and in other areas rendered and cladded. Triple glaze windows, standard rads and 35kw combi boiler. Vent system. Not my spec, but architect recommended it. Zinc roof, not sure of the spec here. I know the sound of cavity block will be met with cringes but only yesterday I was talking to a lady that renovates and extends every year. She said that her last project was similar to the above and apart for the speed of construction, she rarely switches on the heat. She says she will never do cavity wall again. Time will tell.