Wall beam in standing plank wall, correct thinking?

[Barnrikehuset]

Hello!

I am planning to install a patio door (double) in an existing plank wall.

The wall consists of vertical tongue-and-groove planks about 50mm thick, and I've drawn up an opening that is 15x21 with a 220x45 beam above that extends 20cm/side.

There are two roof trusses resting where the opening will be.

The plan is to brace up internally between the floor and ceiling and simply saw out the T-shaped opening.

But with the beam itself, do you just lay it in or does it need to be secured against, for example, lateral forces? There will be several stumps of tongue-and-groove planks resting on it, and I'm afraid they might start to push outwards.

One idea is to place an even larger beam on the outside that screw-glues the tongue-and-groove planks on the top with the actual load-bearing beam.

Or how is it usually done?

 

[Gabbe1]

I don't know how it's usually done, but when I did the same operation on a plank house, I removed the wall to the planks from the inside, then I glued and screwed a 220x45 that was long enough to be attached to two standing planks on either side of the door opening. After the glue dried, I sawed the door opening.

 

[MathiasS]

I think 15 is too long for a single regular timber in 220x45. I would use a lighter glued-laminated timber instead.

 

[Barnrikehuset]

According to the construction descriptions' dimensioning help, a 45x195 is sufficient so I upsized a bit, but on the other hand, it's no major hassle to recess a 42x225 glulam beam instead.

Gabbe1: the beam is therefore not recessed in the plank frame, but the forces are absorbed by the glue joint and the screws. It becomes almost pure shear and some splitting forces on the glue, but I was thinking of recessing it.

But do you need to laterally secure a recessed beam in some way, or are a few toe screws enough?

 

[MathiasS]

The dimensioning aid is probably correct, I rely only on gut feeling and the experience that after a few years, regular studs tend to sag a bit if you don't go all out with the dimensions (almost from their own weight). Glulam does not do that.

 

[Gabbe1]

Nope, not recessed. The plank structure was smooth and even, so the glue joint had a very large area to adhere to.

 

[falkn]

According to the building descriptions' dimensioning help, a 45x195 is sufficient so I slightly upsized it, though on the other hand, it's not much of a hassle to recess a 42x225 laminated beam instead.

Gabbe1: The beam is thus not recessed into the plank frame but the forces are absorbed by the glue joint and the screws. It results in almost pure shear and a bit of tensile forces on the glue, but I was considering recessing it.

But do you need to secure a recessed beam on the sides in some way or are a few skew screws sufficient?

You could attach metal straps on the inside and outside of the bearing points to secure the laminated beam in the plank wall. This prevents the plank wall from being pushed or pulled out.

 

[Barnrikehuset]

You can attach nail straps on the inside and outside of the support points to secure the glulam beam in the plank wall. This prevents the plank wall from being pulled out or in.

Thought a bit about that or maybe large nail plates.

 

[falkn]

Thought a bit about that or like large nail plates.

It was nail plates I was thinking of, just wrote something else If you attach something like 100x200 plates 4 pcs, you have secured quite well.