SketchUp drawing, feedback wanted

[studiomannen]

Hello!
My first post on the forum which I have previously read a lot as a guest.

I am going to build an extension and have made a drawing in SketchUp 7.

It would be fun if you could review it and provide feedback. It is a drawing based on the Enkelstuge concept on a plinth.

I am mainly interested in opinions on the roof truss construction with a laminated beam, but other feedback is also welcome.

Some parts are still missing in the drawing, and some battens and studs are not exactly drawn due to time constraints.

The file is available here >> (packed in a zip)

Regards,
/Roger

 

[cheetah1]

"File is invalid" says Windows.

 

[studiomannen]

Hepp, now I think it should work...
/Roger

 

[studiomannen]

Hello
My question is simple, does this truss construction work? The rafters are 170mm. The glue-laminated beam is 360x90mm. I was thinking of adding an additional 70 underneath for extra insulation. The roof load is tiles on board, the sub-roof will be board. The room is 18 sqm.

Regards
/Roger

 

[andersmc]

It's not really a truss construction, it's a ridge beam construction. The entire load is on the roof beam. It LOOKS a bit flimsy. It will probably hold, but there's a risk that it might sag over time.

 

[studiomannen]

Thanks for the answer, Ryggås... yes, that's what it's called of course

The limbalk is 90x315 about 3900 long. I have increased the roof rafters to 195x45 placed at cc120. The roof will be tiled. It's located in Värmland, so it has to handle some snow.

Should I add more roof rafters?

Best regards,
/Roger

 

[titanium]

You have chosen 90x315 for the beam. Good, as it is more than the minimum requirements of 66x315.

Here you can get some help with dimensions you might consider. However, this is for light roofs and a maximum slope of 10 degrees.
http://www.traguiden.se/TGtemplates/popup1spalt.aspx?id=209&contextPage=1465
You seem to have a span of the roof rafters of just over 3 m according to the Sketchup.
I would set 45x195 on c/c 600 instead. It won't be much extra cost, and you'll have a roof that handles the load without issues.

 

[Danneå]

How big is the difference between 90 vs 66... what is important here is 315...

Then I would probably also use 60 cc spacing

Good luck

 

[studiomannen]

Hmm, hesitating about this with cc.

I think the self-weight becomes too heavy if you set cc 60 but of course, it has to hold.

Is there anyone who thinks cc 120 is enough? I've used Enkelstugan's truss as a model and it's 170 and sits cc 120.

Or is it the congregation's collective opinion that cc 60 is what it should be?

Thanks for the answers!!!

/Roger

The construction is now in progress as you can see...