€65 euro m2 for external insulation ?

RobAMerc

Lads,

I have been offered external insulation for 65m2.
The spec is as follows
adhesive, 10cm polystyren, mechanical fixings,
basecoat, reinf. mesh, primer, finish render,
corner profiles, ins stop profiles, ins start profiles and windows bead

does not include window sills and any services ( ESB points etc ) that need to be catered for.

Does this sound good ? Expensive, too good ?

Thanks
R.A.Merc

Calahonda52

The key services for EI are relocating rainwater gutters and sewer pipes.

Are the gas,fone ,esb boxes buried in the external walls.

Windowsills need doing also
how much insulation will be on the window/door reveals?

Have u any plans to replace either?

RobAMerc

Calahonda52 wrote: »

Are the gas,fone ,esb boxes buried in the external walls.

no, all seem to be on the wall rather than in

Calahonda52 wrote: »

how much insulation will be on the window/door reveals?

I've no idea, is this something I should ask ?

Calahonda52 wrote: »

Have u any plans to replace either?

Yes - the windows and doors go too.
why does this matter ?

MicktheMan

RobAMerc wrote: »

Does this sound good ? Expensive, too good ?

You get what you pay for.:)

Proper ewi detailing should include going down to the footings ( at least 600mm below dpc) and up past the soffit such that the ewi meets the roof insulation. Not doing this may significantly increase the risk of you getting mould on your walls.

On the spec itself, why not go thicker than 100mm? The labour would be the same with only a relatively minimal increase in material. Also, polystyrene isn't breathable, so is this a good idea to be putting on the outside of your walls? Rockwool or wood fibre would be better.

If you are planning on changing the windows/doors, then do this first and move the new windows out flush with the existing walls such that the frames are covered with the new ewi. Then there is no need to worry about the reveal insulation thickness.
Plus, don't forget to have the new frames air tightened to the wall (inner-leaf if a cavity wall).

Tefral

Seems too cheap OP.. I've never seen it for less than €90/m2

Caveat Emptor

vwt

Ive seen a lot of houses get this done recently....average price from talking to neighbours etc was 90-100 per sqm.65 sounds too good to be true and probably is.A job like this needs to be done by professional who do it on a daily basis.Ice seen some awful finishes and some good ones.Im sure the price reflects!

MintyMagnum

How much would a 3bed semi cost to have externally insulated & upgrade of single aluminium windows. (1200 sq ft property) Would it be a lot cheaper to internally insulate & change windows? Thanks

Strolling Bones

RobAMerc wrote: »

Does this sound good ? Expensive, too good ?c

Too cheap - be suspicious.

galwaytt

MicktheMan wrote: »

You get what you pay for.:)

Proper ewi detailing should include going down to the footings ( at least 600mm below dpc) and up past the soffit such that the ewi meets the roof insulation. Not doing this may significantly increase the risk of you getting mould on your walls.

On the spec itself, why not go thicker than 100mm? The labour would be the same with only a relatively minimal increase in material. Also, polystyrene isn't breathable, so is this a good idea to be putting on the outside of your walls? Rockwool or wood fibre would be better.

If you are planning on changing the windows/doors, then do this first and move the new windows out flush with the existing walls such that the frames are covered with the new ewi. Then there is no need to worry about the reveal insulation thickness.
Plus, don't forget to have the new frames air tightened to the wall (inner-leaf if a cavity wall).

I'd be disagreeing with the use of Rockwool or Woodfibre externally, due to their predeliction to absorb moisture, esp over time. EPS/XPS is better, and structurally better for carrying the weight of render(s). Hence it being so widely used.

MicktheMan

galwaytt wrote: »

I'd be disagreeing with the use of Rockwool or Woodfibre externally, due to their predeliction to absorb moisture, esp over time. EPS/XPS is better, and structurally better for carrying the weight of render(s). Hence it being so widely used.

Do you have any examples of failures due to these insulation materials (rockwool/woodfibre)?

BryanF

galwaytt wrote: »

I'd be disagreeing with the use of Rockwool or Woodfibre externally, due to their predeliction to absorb moisture, esp over time. EPS/XPS is better, and structurally better for carrying the weight of render(s). Hence it being so widely used.

Nothing wrong with mineral wool did you see the Denby dale passive house with 300 mineral wool in the cavity. Good as fire retardant and should be used in every house around esb box or party wall cavity barrier also recyclable at end of life as opposed to eps/ pir.

I'd have no problem specifying mineral wool Ewi the reason it's not used is it tends to be about 10/20% more expensive

And it's breathable, so it would work with lime render on rubble stone etc