Floor Insulation

pete6296

Hi Folks,
I will be putting in 50mm insulation in floor in a few weeks, currently getting quotes from plumbers and i wondering if they usually keep piping raised over 50mm so i can slide insulation underneath and then work away with the flow screed.
What is the usual method.
Thanks

Gumbo

pete6296 wrote: »

Hi Folks,
I will be putting in 50mm insulation in floor in a few weeks, currently getting quotes from plumbers and i wondering if they usually keep piping raised over 50mm so i can slide insulation underneath and then work away with the flow screed.
What is the usual method.
Thanks

will 50mm pass the new regs?
in this day and age i would be putting in at least 100mm of insulation imo of course

pete6296

I have been told 50mm Kingspan Kooltherm is adequate.

kceire wrote: »

will 50mm pass the new regs?
in this day and age i would be putting in at least 100mm of insulation imo of course

gummibear

pete6296 wrote: »

I have been told 50mm Kingspan Kooltherm is adequate.

From my limited knowledge (I mean Limited!:D) it depends on P/A ratio. 50mm will give a U-value of 0.25 or better if Perimeter/Area is 0.5 or less but anything greater than that and it might not be adequate.
I take it you not going with UFH.

pete6296

Hi,
Not going with UFH, standard rads throughout

gummibear wrote: »

From my limited knowledge (I mean Limited!:D) it depends on P/A ratio. 50mm will give a U-value of 0.25 or better if Perimeter/Area is 0.5 or less but anything greater than that and it might not be adequate.
I take it you not going with UFH.

ardara1

From July Regs minimum 125mm Polyiso or 200mm Aerobord with under floor heating. Even in current standards 50mm slight - 50mm perhaps in very big floor - possibly 60mm in standard floor to meet 0.25 BUT - advisory note in BS - increase floor insulation by 30% when using UFH

sydthebeat

Pete, the insulation should be in place before the plumber comes.... he wont keep pipes elevated so you can slide insulation under.

as the lads have said above aim for min 60mm insulation, kingspan or otherwise.. not aeroboard.

The plumber can fix his pipes to the isulaion with u shaped ties... DO NOT allow him to fix pipes in place with wet mix cement!!!!

Mellor

100mm imo

sunnysoutheast

We used 2x50mm at 90 degrees from each other with UFH

Don't forget the edge insulation too.

SSE

sinnerboy

Mellor wrote: »

100mm imo

echo that

getfit

sydthebeat wrote: »

The plumber can fix his pipes to the isulaion with u shaped ties... DO NOT allow him to fix pipes in place with wet mix cement!!!!

Why can't he fix the pipes with wet cement??? What's the risk/downside?

pete6296

Hi,
But the constant traffic etc, would that not damage piping or do i simply place it where plumber will be running pipes. Pouring of screed would be a long way down the road after drylining etc.
Thanks

sydthebeat wrote: »

Pete, the insulation should be in place before the plumber comes.... he wont keep pipes elevated so you can slide insulation under.

as the lads have said above aim for min 60mm insulation, kingspan or otherwise.. not aeroboard.

The plumber can fix his pipes to the isulaion with u shaped ties... DO NOT allow him to fix pipes in place with wet mix cement!!!!

sydthebeat

getfit wrote: »

Why can't he fix the pipes with wet cement??? What's the risk/downside?

the cement will set... the new floors slab wont adhere to this set cement therefore the floor in essence at these points is more prone to cracking. Also, this wet mix is hardly every to the same cement grade as the floor slab will be..... which adds to the above issue. Its simply poor workmanship.

pete, i dont understand your last post..... whats is 'it'???

if you are worried about the insulation being down for too long, well thats down to project management... the ideal situation is:
day 1... lay insulation.
day 2.... plumbing installed.
either late day 2 or early day 3... floor slab poured.

River King

Hi,

Just started my house build recently. Is 100mm Aeroboard underfloor insulation adequate? No underfloor heating system, just rads.

sydthebeat

River King wrote: »

Hi,

Just started my house build recently. Is 100mm Aeroboard underfloor insulation adequate? No underfloor heating system, just rads.

that may just meet the regs...

but you would be much better off with laying 2 x 50mm of kingspan or xtratherm, as above.

BadCharlie

I put down i think 70mm or 75mm Insualtion. Now knowing what i know now i wish i went with 100.

Also talk to the plumber. If your only doing rads in the house and not underfloor heating. I would think it would not matter if the plumber came in and did his work first. Might mean a tiny bit more work when doing insulation after.