which type of wall??

lovehathi

Hi we r planning an double story extension to our house on side with planning permission, our architect has designed hollow block wall with 100mm insulation inside and then slab and skim.
Some were i read cavity wall is better ??

So we r confused which one should we go for and cost wise what are the impact on each one?

Thanks

Gumbo

Have you got an Engineer on board?
If so, do they have any specific requirement for the gable wall to take the loads from the roof?

lovehathi

hi kceire

we don't have engineer but we did hire architech to do the drawing for planning, the plan shows same wall from bottom to top and roof extended from old house to new extension , only on description it says 215mm soild or hollow block or 250mm cavity wall

Gumbo

lovehathi wrote: »

hi kceire

we don't have engineer but we did hire architech to do the drawing for planning, the plan shows same wall from bottom to top and roof extended from old house to new extension , only on description it says 215mm soild or hollow block or 250mm cavity wall

Planning drawings are not construction drawings. My advice is to get an engineer to spec the way and work the insulation options through him/her.

lovehathi

hi kceire, we spoke with our architect he said these drawing are enough for construction, as he has designed all the load bearing steel were it is required and specified the dimension of window and drainage. So now we are confused what should we do

if we go for engineer how much should we expect to pay it 39.8 sq meter in total

thanks

BryanF

IMO drylining with cavity block, is a lazy unsuitable method for any newly constructed wall.

Some architects are so focused on design they don't acknowledge/pay enough attention to appropriate materials and methods.

Johnnyhpipe

Typically architects don't design steelwork. The engineer would be respnsible for structural design usually. That said, maybe this guys a one stop shop..so check if he has appropriate PI Insurance to design/certify structural elements.

It is more likely however that your planning drawings indicate rather than specify steel beam locations. Planning dwgs are usually very basic and not detailed enough for construction.

lovehathi

thanks Johnnyhpipe and BryanF , So how much should i expect for engineer to do so , also which type of wall should i ask him to consider while design and also if we go cavity wall type we dont have to insulate out or inside the house??
Also cost wise which is more, if u have rough idea.

Thanks

Gumbo

lovehathi wrote: »

thanks Johnnyhpipe and BryanF , So how much should i expect for engineer to do so , also which type of wall should i ask him to consider while design and also if we go cavity wall type we dont have to insulate out or inside the house??
Also cost wise which is more, if u have rough idea.

Thanks

You won't tell him what wall to design, he will tell you.
Engineering services for structural design, supervision and certification in my recent experience here in Dublin, approx €750 plus VAT. Price may differ on location and/or how much you use the engineers for supervision.

lovehathi

any recommended engineers have good experience we r in dublin 12 area
thanks

Gumbo

lovehathi wrote: »

any recommended engineers have good experience we r in dublin 12 area
thanks

PM sent

MAJJ

kceire wrote: »

PM sent

Could you also please PM that engineers name, thank you.

MAJJ

BryanF wrote: »

IMO drylining with cavity block, is a lazy unsuitable method for any newly constructed wall.

Some architects are so focused on design they don't acknowledge/pay enough attention to appropriate materials and methods.

Hi Bryan, what alternative construction method would you recommend? Thank you

BryanF

MAJJ wrote: »

Hi Bryan, what alternative construction method would you recommend? Thank you

Insulated Cavity
External insulation block on flat
Timber frame
Aerrated 360wide concrete blocks
And many more

lovehathi

i am attaching this image , just to see if this can be used for construction straight ahead also the wall type is it ok?
thanks

lovehathi

hi every one any thought of this plan be used for build without engeneer?? and wall insulation is it right

thanks

Gumbo

lovehathi wrote: »

hi every one any thought of this plan be used for build without engeneer?? and wall insulation is it right

thanks

Who is signing off on the build? It's their call, not the internets.

lovehathi

it was just to see if the wall details for insulation were ok or any recommendation. I know internet doesn't pay some ones advice..

Calahonda52

some bedtime reading
http://www.environ.ie/housing/building-standards/tgd-part-d-materials-and-workmanship/technical-guidance-documents
and
https://www.nsai.ie/S-R-54-2014-Code-of-Practice.aspx

There are also acceptable construction details some where on the first link

Your images are silent on the external render spec, careless.
also silent on the internal VB/AT layer, where as he spec'ed the tyvek or similar
I would go for counter batten roof with full fill insulation.
the spec is silent on if the internal insulation is alu foil lined, if so then the VB/AT layer is a waste of money.

Ur arci needs to flesh it out in a lot more detail, especially as the proper VB/AT layer material is not cheap and needs to be done properly.


Additional thoughts
The essential ideas here are:
when vapour gets past the barrier from inside out, it has to be able to get out so the construction needs to cater for that. Alu foil is impermeable, period.
internal insulation brings the dew point further into the wall which is never a good idea
Airtightness is more important than insulation so it has to be done right as poor AT will negate the value of insulation