Q
quattro12321 Mar 2020 10:31Hello,
we are building according to the energy-saving regulation standard, using 36.5cm (14.4 inches) bricks. Our site has a slight slope, so the south side on the ground floor is directly against the earth, while the north and east sides are at ground level. Our architect applied perimeter insulation along the entire foundation down to 80cm (31.5 inches). Now the shell constructor said that this was not fully accounted for in the initial quote due to extra excavation and additional reinforcement, and that there will be considerable extra costs for us.
He then suggested that we could completely omit the insulation at the eastern end because that whole floor will be covered by earth anyway. At the front side, he also said he could leave out the foundation insulation if I want, to save costs. I was a bit skeptical about this and discussed it with my architect (who officially only supports me up to the approved plans).
The architect said omitting the insulation at the back is fine, but at the front he would recommend insulating down "at least" 60cm (23.6 inches), which would still be acceptable. After checking with the shell constructor, that would also cost significantly less than insulating the full 80cm (31.5 inches)... I can live with these additional costs.
My question to the experts here: What do you think? Is 60cm (23.6 inches) insulation at the front sufficient, or would you recommend going for the full 80cm (31.5 inches)?
The slab itself will only be insulated from the inside.
Thanks, best regards, and stay healthy!
we are building according to the energy-saving regulation standard, using 36.5cm (14.4 inches) bricks. Our site has a slight slope, so the south side on the ground floor is directly against the earth, while the north and east sides are at ground level. Our architect applied perimeter insulation along the entire foundation down to 80cm (31.5 inches). Now the shell constructor said that this was not fully accounted for in the initial quote due to extra excavation and additional reinforcement, and that there will be considerable extra costs for us.
He then suggested that we could completely omit the insulation at the eastern end because that whole floor will be covered by earth anyway. At the front side, he also said he could leave out the foundation insulation if I want, to save costs. I was a bit skeptical about this and discussed it with my architect (who officially only supports me up to the approved plans).
The architect said omitting the insulation at the back is fine, but at the front he would recommend insulating down "at least" 60cm (23.6 inches), which would still be acceptable. After checking with the shell constructor, that would also cost significantly less than insulating the full 80cm (31.5 inches)... I can live with these additional costs.
My question to the experts here: What do you think? Is 60cm (23.6 inches) insulation at the front sufficient, or would you recommend going for the full 80cm (31.5 inches)?
The slab itself will only be insulated from the inside.
Thanks, best regards, and stay healthy!
Whether this is possible without negative effects is something the person who prepared the thermal insulation certificate can tell you. In general, the thermal insulation will change, which in the worst case could affect the building permit / planning permission. Besides that, I wouldn’t risk getting into trouble over a few hundred euros. There is usually a good reason why it was planned this way, and if the deviation leads to problems later on, you will be the one to blame.
Best regards
K1300S
Best regards
K1300S
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