Is it possible to reinforce the ridge beam in some way?

[DanielPinjegård]

Sounds like you should use an insulation from Monier called Clima Comfort 100mm. It weighs just a few kilos per m2. Then you build the roof as usual in principle. Low overall building height and no permits required from the municipality. Good insulation value.

 

[JF.]

Sounds like you should use an insulation from Monier called Clima Comfort 100mm. It only weighs a couple of kilos per m2. Then you basically build the roof as usual. Overall low building height and no building permits required for the municipality. Good insulation value.

Is it some kind of foam?

 

[DanielPinjegård]

Is it some form of cell plastic?

Well, it's a diffusive material. Go and read about it on their website. It should have everything you want to know there. Otherwise, call Johan Johansson at the Jönåker factory, and he'll help you with answers.

 

[justusandersson]

A quick and rough estimate points to a significant under-dimensioning of all longitudinal roof beams when you are finished with the renovation. The National Board of Housing, Building and Planning's map of snow loads is currently unavailable due to computer maintenance, but I guess at snow zone 2.5. My conclusion is that the ridge beam needs to be reinforced with 2x45x165 and the side beams with 2x45x135. You can glue these reinforcement pieces from underneath and lock them with 12 mm k-plywood sheets screwed from both sides. You may need to make some arrangements to create a functioning press for gluing. You can also use 90 mm wide glulam. A 90x180 beam (minimum height) and a 90x270 (homogeneous) that you split in half.

 

[JF.]

A quick and approximate estimate points to a significant underdimensioning of all longitudinal roof beams when you are finished with the reconstruction. Boverket's map of snow loads is not available right now due to computer maintenance, but I guess at snow zone 2.5. My conclusion is that the ridge beam needs to be reinforced with 2x45x165 and the side beams with 2x45x135. You can glue these reinforcement pieces from underneath and lock them with 12 mm k-plywood boards screwed from both sides. You may need to make some arrangements to get a functioning glue press. You can also use 90 mm wide glued laminated timber. A 90x180 beam (minimum height) and a 90x270 (homogenous) which you split in half.

Thank you so much! Is it easier to redo the entire roof than to reinforce the existing ones?
If the roof were redone maybe it would be possible to change the roof pitch as well, thereby getting better ceiling height on the upper floor.

 

[JF.]

A quick and approximate estimate indicates a significant under-dimensioning of all longitudinal roof beams when you are finished with the renovation. Boverket's map of snow loads is not available right now due to computer maintenance, but I guess for snow zone 2.5. My conclusion is that the ridge beam needs to be reinforced with 2x45x165 and the side beams with 2x45x135. You can glue these reinforcement pieces underneath and secure them with 12 mm plywood sheets screwed from both sides. You may need to make some arrangements to get a functional glue press. You can also use 90 mm wide laminated wood. A 90x180 beam (minimum height) and a 90x270 (homogeneous) that you split in half.

Does the pillar in the middle also need to be reinforced, or is it sufficient even with the reinforcement? If the ridge beam is built up with 165mm in height, how long a span can it handle?

 

[justusandersson]

Is it easier to redo the entire roof than to reinforce the existing ones?

I wouldn't dare to answer that, but it can definitely be much better. Changing the roof pitch can be problematic if the house is within a detailed plan. Check with the municipality. I calculated based on the current spans of the beams. Columns usually have significantly larger margins than beams.

 

[JF.]

I don't dare answer that, but it can clearly get much better. Changing the roof slope can be problematic if the house is within a detailed plan. Check with the municipality. I calculated with the current spans of the beams. Columns usually have significantly larger margins than beams.

thanks for the answer!