B&Q Attic Insulation rolls

nudger

100mm Insulation rolls reduced last week to €17.60 now reduced to €9.30, never seen it that cheap before.
200mm rolls are 11.60 I think.

DavyD_83

Hey Nudger, Any link or details of which one has been reduced.
I could do with some attic insulation, but don't know where to start; and can only find products on B&Q UK with sterling prices. Even more confused now...

paddyp

It its their own brand recycled glass or plastic bottle stuff I wouldn't bother. I have rockwool I gt on sale there on the left side of my attic and own brand on the right side the rockwool is over the quoted 200mm and was self expanding and the b&q stuff had to be manully fluffed up and never reached its quoted thickness. There were patches where the glass fibres were melted together like toffee I'd hazard a guess that these are seconds from another manufacturer. Bought ecowool from connacht gold and it was very similar.

Kristopherus

The most user-friendly attic insulation you can get is the Knauf Space Blanket. It is usually available here from Homebase and B & Q. They usually have deals coming up to Christmas & New Year.

nudger

DavyD_83 wrote: »

Hey Nudger, Any link or details of which one has been reduced.
I could do with some attic insulation, but don't know where to start; and can only find products on B&Q UK with sterling prices. Even more confused now...

Its their own brand stuff as others have said, Eko roll, haven't opened a roll of it yet so don't know the quality.
Looks ok, if I do it tomorrow will let you know.

kodoherty93

You need a minimum of 300mm in your attic to feel the real benefits and dont forgot to insulate the trap door

nudger

kodoherty93 wrote: »

You need a minimum of 300mm in your attic to feel the real benefits and dont forgot to insulate the trap door

Any top up amount will help.
Most older houses 20 years + will only have 100mm and older ones might have nothing.
100mm between the joists is what most houses have.
You should then add 200mm across the top, that's a foot thick in old money.
Make sure there are no electrical wires under the insulation,do not put any insulation under any tanks in the attic.

300mm is what they would call best practice.

paddy147

Or you could do this,and be sorted for life.

paddy147

You can buy Knauf 150 and 170mm in the UK for as little at £3 50 pence a roll.

nudger

Hi Paddy
ball park for an average simi d, say 18 ft by 26 ft for the foam treatment, i know every job is different but ball park.
thanks.

the uk rolls are sub'd by the government, pitty ours couldn't think that way instead of stupid grants.

ted1

paddy147 wrote: »

You can buy Knauf 150 and 170mm in the UK for as little at £3 50 pence a roll.

Yeah but you can not by them as you need to register them to a UK address.

paddy147

ted1 wrote: »

Yeah but you can not by them as you need to register them to a UK address.

:D

Merch

I looked at the B & Q stuff before, I could find no fire rating?

I know the heat increase in electrical wiring is a consideration when laying insulation.
When I looked at the material as best i could through the wrapper, looks like it go up in a second, that and it being on top of wiring??
I could probably work out if the wiring is safe (take time) but without some rating on the insulation, how does it stack up to other products?
I saw ratings on other rockwool type materials.

cgarrad

Spray foam is about €18 per sq meter

paddy147

Merch wrote: »

I looked at the B & Q stuff before, I could find no fire rating?

I know the heat increase in electrical wiring is a consideration when laying insulation.
When I looked at the material as best i could through the wrapper, looks like it go up in a second, that and it being on top of wiring??
I could probably work out if the wiring is safe (take time) but without some rating on the insulation, how does it stack up to other products?
I saw ratings on other rockwool type materials.

You should try to place any electrical wiring ontop of the insulation.:)

Merch

paddy147 wrote: »

You should try to place any electrical wiring ontop of the insulation.:)

Even in an enclosed space the there may be a difference.
I'd hazard a guess most domestic wiring would be ok due to the lengths and uses involved, all the same if I was covering my attic, Id try do a calculation on it, be a pain in the ass if it worked out the wiring had to be upgraded, but I doubt it.
Unfortunately when the wiring was done in mine they didnt leave any allowance in the wiring to move it at all, (Ive only seen the attic, not between the ground and first floor)

Is it an advantage to insulate between floors? I'd have thought the periphery of a building would be the priority.
Where did you get the eave plastic coverings.
I was thinking of getting something like that for where the attic (floor) meets the eaves, to maintain the ventilation gap, then press rolls up against it, but have seen nothing

paddy147

The vent cards were supplied and installed by the spray foam company.....(prior to the foam being sprayed into the attic spaces)

paddy147

Quite a few builders providers are selling Knauf 100 and 150mm for 17 euro a roll.

viztopia

ted1 wrote: »

Yeah but you can not by them as you need to register them to a UK address.

Would it work if you had a northern ireland address?

ted1

viztopia wrote: »

Would it work if you had a northern ireland address?

No I said a UK address
Northern Ireland is excluded from the scheme. Reckon there's to many cute builders in Louth who would find a work around. Paddy any chance you from Louth?

shakedown

paddy147 wrote: »

Quite a few builders providers are selling Knauf 100 and 150mm for 17 euro a roll.

Can you PM me names (in Dublin)?

Thanks

ezra_pound

ted1 wrote: »

No I said a UK address
Northern Ireland is excluded from the scheme. Reckon there's to many cute builders in Louth who would find a work around. Paddy any chance you from Louth?

By the way Uk DOES include Northern Ireland.

ezra_pound

ted1 wrote: »

No I said a UK address
Northern Ireland is excluded from the scheme. Reckon there's to many cute builders in Louth who would find a work around. Paddy any chance you from Louth?

You may be confusing Great Britain with The United Kingdom of Great Britain and Northern Ireland.

ted1

nope, no confusion, but this is the bargain forum not the politics forum.

paddyp

Merch wrote: »

I'd hazard a guess most domestic wiring would be ok due to the lengths and uses involved, all the same if I was covering my attic, Id try do a calculation on it, be a pain in the ass if it worked out the wiring had to be upgraded, but I doubt it.

Presumable the vast majority are 1.5mm light wiring. For lights at most you'd probably have to derate by installing a smaller mcb at the consumer unit. If theres already a 10A mcb and the run in insulation is short might not be necessary. Socket, shower and cooker cables would be the main issue.

Merch

paddyp wrote: »

Presumable the vast majority are 1.5mm light wiring. For lights at most you'd probably have to derate by installing a smaller mcb at the consumer unit. If theres already a 10A mcb and the run in insulation is short might not be necessary. Socket, shower and cooker cables would be the main issue.

As its only the attic I need to be worried about, its only light circuit for the upstairs I need to be concerned about really, I do have a power shower twin and earth but I ensured that was the next size up when it was installed, think it is 16 square. I know it can be calculated for being laid in insulation and I have done that before, but it means I have to look it up again, not a big deal really.

I wonder would derating the MCB mean the light circuit could start nuisance tripping out? (edit, i guess that all depends on the specific length of my wiring, I presume I calculate the full length of wiring from the consumer unit, I don't think light circuits are ring, but that can easily be checked.

I was thinking of calculating it and seeing if its needed and then if it is,
either increase the wiring size for the affected wiring (not ideal as the feed from the consumer unit will still be 1.5 sq and that is embedded somewhere in the walls)
Or
Just not covering the area with wiring, which is awkward as the wiring was laid in as short as possible runs and not parallel to the joists :mad:

I actually didnt think of derating the MCB, which is a good idea and I doing a calculation will show if that will be a problem too anyway.

paddy147 wrote: »

The vent cards were supplied and installed by the spray foam company.....(prior to the foam being sprayed into the attic spaces)

I am looking for vent cards, but a type that goes into the space where the inside of the roof meets the inside of the soffit/facia, I've seen drawings of an angled vent card that accounts for this join, but have not seen them around, having said that I haven't looked in earnest yet.

Capt'n Midnight

paddyp wrote: »

Presumable the vast majority are 1.5mm light wiring. For lights at most you'd probably have to derate by installing a smaller mcb at the consumer unit. If theres already a 10A mcb and the run in insulation is short might not be necessary. Socket, shower and cooker cables would be the main issue.

If you are using CFL / LED instead of incandescents then derating lighting MCB should be fine.

But double check if any sockets are supplied from the attic.
In my case all the sockets, upstairs and downstairs, outside the kitchen are on a single ring :mad:

paddy147

shakedown wrote: »

Can you PM me names (in Dublin)?

Thanks

Chadwicks,Heiton Buckleys,Smiths Building Supplies,Grange Builders Providers,Newtown Building Supplies,PH Ross,TJ O'Mahonies,Goodwins Builders Providers,OutHauz...and a few more.:)

paddy147

Also install fire retardant and insulated downlight covers too.:)........if you have downlights.

vicwatson

paddy147 wrote: »

Quite a few builders providers are selling Knauf 100 and 150mm for 17 euro a roll.

Picked up a leaflet in Chadwicks today and they are doing the following on insulation (no particular bargains I might ad;))

Knauf 150mm (6.87sq meter) Earthwool €18.95 buy 10 get one free

Rockwool insulation 6" Thickness (4.38 sq meter) €32.00

Rockwool insulation 4" Thickness (5.76 sq meter) €27.00

nudger

Put down the Eko insulation today and found it fine, none of the problems mentioned earlier.
Earthwool handles a bit nicer but the B&Q roles are well priced.