Mansard truss with raised wall section

[Jesperlann]

Hello!

We are sketching an extension to our house with a mansard roof. The main house has two courses of logs, which are then topped with mansard roof trusses. Do you have any construction examples of how to build a mansard roof truss with a raised wall height? It should preferably leave as much floor space as possible. Attached is a picture of the desired shape.

 

[justusandersson]

A classic solution for a mansard truss looks like in the attached image. The wall plate height is not affected by this.

 

[Jesperlann]

Okay, but we have an extension of the house where there is about a 1m high vertical wall and then a sloping roof without any pillars at the breaking point. Unfortunately, it is not possible to see how it is constructed. That's something we are looking for.

 

[justusandersson]

One can have a longitudinal beam at the breakpoint. If you are building new, there are many possibilities.

 

[Per Stenmar]

Hi!

We are sketching an extension to our house with a mansard roof. The main house has two rounds of timber on which the mansard trusses stand. Do you have any construction examples on how to build a mansard truss with a raised wall plate? Preferably, it should leave as much floor space as possible. Attached is a picture of the intended shape.
[image]

Hi,

We are also planning an extension and have the same situation, how did you solve the truss construction?

//Per

 

[Jesperlann]

Hello, the extension ended up with regular rafters, but we modified a section that previously had "kattvindar" and then we moved the struts closer to the outer wall and we have a longitudinal rule at the break point. We also reinforced with nail plates at the break point.

 

[Per Stenmar]

Hello,

thanks for the response. Yes, we also have a solution proposal where we have a longitudinal beam/glulam in the break of the mansard roof, which then rests on columns on each short side. But then you have that and support legs, trying to remove the support legs to maximize the floor area

//Per

 

[Jesperlann]

Hello,

thank you for the reply. Yes, we also have a solution proposal where we have a longitudinal beam/glulam in the break of the mansard roof, which then rests on pillars on each short side. But then you have that and struts, trying to get rid of the struts to maximize floor space

//Per

I was a bit deceived, meant with transverse. If you have longitudinal, you avoid the struts.