Let sheet metal facade remain when adding external insulation

[Johan-]

Is there an expert who can clarify both the negative and positive losses and gains of adding insulation and installing new paneling directly on the existing metal facade? The house's structure, by the way, is a 75mm plank wall.

 

[Gabbe1]

One disadvantage might be that the sheet metal acts as ventilation, allowing cold air to enter behind the insulation. Additionally, the sheet metal (depending on the type) adds a few centimeters to the wall thickness unnecessarily. With additional insulation, there are often problems with it looking aesthetically strange with small roof overhangs and deep window recesses outside, and it's unnecessary to exacerbate that.

The only advantage I might think of is that the sheet metal could contribute to a somewhat more windproof wall, but I would absolutely have removed it; it's easy to install a wind barrier or insulate with a windproof material.

 

[Johan-]

A disadvantage could be that the sheet metal acts as ventilation allowing cold air to enter behind the insulation. Additionally, the sheet metal (depending on the type) adds a few centimeters to wall thickness unnecessarily. When adding insulation, there are often problems with it looking aesthetically strange with small eaves and deep window reveals outside, no need to worsen that unnecessarily.

The only advantage I might think of is that the sheet metal could contribute to a somewhat more windproof wall, but I would definitely have removed it; it's easy to put up windproof fabric or insulate with a material that is windproof.

Thanks for the tip. The reason I'm weighing the question is that there are 550 sqm of sheet metal to take down, and I would really like to avoid that maneuver if it truly doesn't provide added value or however you want to put it.

 

[hama65]

Tear off the sheet metal and sell it to a scrap company.

 

[Johan-]

Tear down the sheet metal and sell it to a scrap company.

I get about 1400 SEK for the sheet metal minus gas for several trips to the scrapyard minus the extra work to take it down, it doesn't seem worth it. It would have been a good suggestion if the price per kilo was better.

 

[TimPellet]

What kind of metal is it? What does it look like behind the metal? If you can seal/fill the spaces so that air cannot circulate, then there shouldn't be any problem with having metal left in the wall, right?

 

[sblixten]

One risk is that it gets a lower temperature (at different times and for various reasons) than the surrounding material and thus condensation can form inside the wall.

 

[Johan-]

What kind of sheet metal is it? What does it look like behind the sheet metal? If you can seal/fill the space so that air cannot circulate, there shouldn't be any problem keeping the sheet metal in the wall, right?

Ordinary galvanized and lacquered sheet metal, I would guess. Filling the space behind the sheet metal involves more work than tearing it down. An alternative could be to cut the sheet metal straight at the bottom and install a beam that extends more than the sheet metal, where the beam also acts as a barrier against rats and mice. It won't be completely airtight in that case.

 

[Johan-]

One risk is that it gets a lower temperature (at different times and for various reasons) than the surrounding material, and thus condensation can form inside the wall.

I understand what you mean, while condensation in the wall is something I want to avoid at all costs.

 

[Johan-]

Starting to realize that it will involve just as much work if I leave the metal facade in place, and also some moisture risks. If I'm going to recycle the metal facade anyway, I can take it down quickly without worrying about damaging the metal. The question is, what is the fastest way to remove the farmer screws that hold the metal, besides unscrewing them with a screwdriver in drill mode?