Is anchor screws no longer available?

[nova383]

Hi.
I'm putting the house together, on top of the 45x170 wall plate there should be a 22x170. I installed that tonight.
The trusses should be attached with angles and anchor screws, but I don't like that a 40mm anchor screw will only grip a maximum of 18mm in the 45x170 wall plate. The trusses should also have angled screws, but I would have liked to fasten the angle brackets with 70-75mm anchor screws.
Or should I just use regular wood screws, e.g. 5x70?

 

[Probably Wrong]

5x50 exists, but haven't seen longer. A quick Google search says that among others, Harald Nyborg has them https://www.harald-nyborg.se/halsag-bi-metall-38-mm.html

 

[nova383]

Googled but didn't find these, but they still feel short. Will probably opt for 5x70 wood screws anyway then.

 

[NoOne2k]

If you screw your 22x170 with proper wood screws into the beam, there should be no problem mounting the fittings with 40mm anchor screws.

 

[nova383]

If you fasten your 22x170 with solid wood screws into the frame, there should be no problem mounting the fittings with 40mm anchor screws.

Solid or not... The 22 is fastened with those jet screws, I think they are 6 x40 about 30cm apart and crisscrossed.

 

[A.G]

https://www.xlbygg.se/vanersborg/sortiment/fastdon-beslag/skruv/skruv-vvs-a2-5-5x60-100st-4455

https://www.xlbygg.se/vanersborg/api/artikel/dokument/5c5ab0599cddd319946018/Produktdatablad.pdf

 

[NoOne2k]

Proper or proper... the 22 sits with those jet screws I think they are 6 x40 about 30cm apart and crosswise.

Now you've already screwed it and it will surely hold, but if I had done it, I would have screwed 170x22 with 60mm long screws.

[link]

[link]

VVS-skruv with a countersunk head is not recommended for building fittings. Or was it mislinked?

 

[nova383]

You've already screwed it in and it's likely to hold, but if I had done it, I would have used 170x22 with 60mm long screws.

VVS-screw with countersunk head is not recommended for construction fittings. Or was it mislinked?

There were 50mm anchor screws there, but that's still too short.
Mounting screw? Big head on them anyway... but maybe a bit weak. Why not countersunk? It should center well and grip firmly in the fittings?

 

[Testarn]

Hi. I'm putting together the house; on top of the tie beam 45x170, there should be a 22x170. I've set it up tonight. The roof trusses should be attached with angles and anchor screws, but I'm not happy that 40mm anchor screws will only grip a maximum of 18mm in the 45x170 tie beam. The roof trusses should also have skew screws, but I would have liked to have the angle brackets fastened with 70-75mm anchor screws. Or is it just better to use regular wood screws, e.g., 5x70?

I became a bit curious about what forces you want to counteract with the screw? The roof trusses' angle brackets should primarily (?) prevent the roof truss from moving sideways and slightly counteract lift if it storms?

With 4-6 anchor nails/anchor screws per angle, you have very large resistance against sideways forces even if they are in the board+tie beam. (why the board is another question I asked myself)

The lifting forces that occur on a roof are partly counteracted by the roof's own weight and partly by the attachment, and if the board is properly attached to the tie beam, I wonder how much wind it would take to cause a lifting force that pulls out 8-12 anchor nails/anchor screws per roof truss? (with an angle on each side, otherwise 4-6 screws) Additionally, if you are going to skew screw the roof trusses in the tie beam, there are even more counterforces to the lifting force that occurs.

I think it sounds like anchor screws should be enough, possibly buy 4.8x50 mm if you want better fastening in the beam/tie beam.

I perceive an anchor screw as quite a bit more powerful/stronger than a "regular" wood screw (even though I haven't calculated it or seen any figures) especially against shearing.

 

[roli]

The angle brackets on the rafters are mainly to prevent the truss from shifting sideways and somewhat counteract uplift force if there is a storm?

The trusses also act as tension ties to prevent the walls from "bulging" out under stress.

 

[Nicro]

Not assembly screw. If you screw them in even slightly crooked, it's easy to crack the head.

 

[nova383]

I have about 250 pieces of 5x60 that I plan to use, countersunk, centered and should hold as well as 4.8 anchor screws, maybe even greater shear resistance due to the countersinking, the screw can theoretically bend a bit before it "cuts" off, but just a thought.

22x170 is placed on top to align and tie together the wall modules/blocks. There's also a 45x190 on edge under the horizontal 45x170 top plate. The standing one also ties the modules/blocks together. Placed the last one like that today, seems as stable as anything.

I will screw straight through the horizontal 22x170 and 45x170 into the standing 45x190, came up with that today, so that 22 should be fixed and it should really be enough with regular anchor screws, right?

 

[nova383]

I usually exaggerate a lot.... Belt and suspenders, maybe not everywhere but it doesn't hurt on things that you can't do anything about later.

 

[NoOne2k]

Cleaned the garage for some Saturday fun I have some ankarskruv left from an earlier stage in my ongoing building project. The difference between an ankarskruv and a regular wood screw is the diameter just under the head. A 4.8 mm ankarskruv is exactly 4.8mm there. The other screw in the picture is a 6x140, the length in this case is unimportant but the unthreaded part just under the head is only 4.3mm.

 

[roli]

There may be more differences between screws, such as material, hardness/softness, hardened/non-hardened, surface treatment, etc. With this, I want to say that it's difficult to compare screws directly, just based on, for example, the diameter. Many of these details are also difficult to find for each screw, as not everything is listed on a box.