"Align" roof trusses

[jnel]

Hi!

I'm currently furnishing an attic in my older house and will be "splicing on" (is that the right term?) 32x100 mm joists onto the roof trusses to make room for more insulation.

Are there any tips and tricks to get them (the joists) at the same depth, so it turns out straight and nice? (and not a roller coaster)

(I could draw a couple of horizontal strings on the roof trusses to align them. But I'm sure you have lots of useful tips and tricks.)

Best regards / Jonas

 

[lajsiiwan]

We raised trusses on a big damn barn at work and used 4 strings placed across everything. Then we built up with studs to the string before laying sheet metal on it. Turned out very well.

 

[vagabondo]

Strings work excellently. Did so recently, however, I wasn't careful with the string where the rafters "break off" against the sub-roof, which caused the drywall panels not to fit properly there.

 

[jnel]

Don't know if I'm "overanalyzing" But how do you know the strings are completely straight if you don't have a "fixed point" to measure and start from. Do you have to rely on "eyeballing"?

 

[lajsiiwan]

Start from the two outermost ones. The roof trusses on the outer walls are hopefully in line with each other unless the house has settled too badly ^^

 

[Mäster]

Or measure to find out which truss is the lowest and let it determine the height of the rest.
Maybe you can borrow a laser or have one yourself, as an aid to get two points at the same level, to set the string from...
If the floor is not level enough to start from.

 

[Linus_E]

wouldn't it be possible to attach 195x45 on the side of the old dikt against the roof battens? or is it already insulated?

 

[jnel]

You mean to make room for more insulation?

I am aware that it might be a bit on the stingy side. However, the attic space is quite small, so thicker insulation would steal a lot of room. However, I will add an additional 45mm on top of the initial 95.

 

[anaitis]

"laska på"

Laskar is what you do when splicing timber lengthwise. The expression you're looking for is "sala på" or "sadla på".