roof trusses with raised wall plate

[oswim]

hey all kings!

Is there any king out there who has a recommendation for roof trusses for my barn house. 15.6x4.8m (slab dimensions)

span: 4.8m (foundation's outer dimensions)
45-degree angle
no load-bearing interior walls

what do you think?

 

[justusandersson]

You need to provide more details if you want a useful answer. Number of floors, height measurements. What do you mean by "ladhus"? Why is an elevated wall needed?

 

[oswim]

You need to provide a bit more information if you want a useful answer. Number of floors, height dimensions. What do you mean by barn house? Why is an elevated wall needed?

Missed the wall height. It should be 700mm. But otherwise, shouldn't that not matter? Why is the number of floors relevant? The height dimensions should be related to the angle and span, right? Or am I wrong?

Best regards

 

[justusandersson]

It is not clear whether it is a one-story house or taller. Is it a new build? As a potential respondent, one does not want to sit and guess. An elevated wall life usually requires a brace connecting the eaves to the lower part of the support leg, similar to an old-fashioned so-called Swedish truss. With such a limited span and 45° pitch, you might otherwise manage without support legs.

 

[oswim]

It is not clear if it is a single-story house or higher. Is it a new build? As a potential responder, you don't want to sit and guess. A raised wall head usually requires a diagonal brace that connects the eaves to the bottom of the support leg, similar to an old-fashioned Swedish truss. With such a limited span and 45° slope, you might otherwise manage without a support leg.

aaah okok. it is a new build. ground floor plus attic

 

[oswim]

Made a sketch

 

[prototypen]

Can't the walls be made 70 cm higher and provide better support for the high leg without "the elevated wall life" bulging outward?

Protte

 

[oswim]

Can't you make the walls 70 cm higher and get better support for the high leg without the "raised wall life" buckling outward?

Protte

Hmm, I'm not quite sure what you mean?

 

[justusandersson]

The only thing missing is a hanbjälke (can be replaced with a steel rod). The wall life should be part of the exterior wall on the ground floor; otherwise, the truss cannot look that way. That's what Protte means.

 

[prototypen]

It will be the fastening of the intermediate floor that becomes critical; the intermediate floor functions as a collar beam and holds the house together and counteracts the outward thrust of the rafters.

Protte

 

[justusandersson]

One should also have a tie beam higher up to reduce the dimensions of the rafters.

 

[oswim]

Okok! I think I get it. Like this? so that the frame continues down into the sill?

 

[prototypen]

Exactly the kind of house I have.

Protte

 

[justusandersson]

Exactly so.

 

[oswim]

I have started sketching a bit on the frame and the meeting between rafters. How would you have done it?

I am thinking of building them on the ground and winching them up onto the frame. Do you fasten them with angle brackets only? Or do you want a wedge between the wall plate and top chord?