Anchor bolt thickness and spacing

[Vijay]

Just wondered with you ICF guys, what size anchor bolts did you use for joist wall plates and wall plates for roof trusses? Also what spacing between them?

 

Cheers

 

Vijay

[Mr Punter]

Using Polarwall I replaced the inside XPS with 10 x 2 timber with coach screws at 400 ctrs facing the core. Screwed them in about 40mm deep with an impact driver so there was 60mm cast in the concrete core. We later used face fix joist hangers.

 

I think we went with 10mm coach screws.

 

https://www.screwfix.com/p/turbocoach-coach-screws-yellow-zinc-plated-10-x-100mm-50-pack/89717

[Russell griffiths]

For roof hold down 12mm spaced at 1200mm

for first floor pole plate 16mm spaced either side of hangers, very over kill but they don’t cost a lot. 

 

First floor. 

Edited August 26, 2019 by Russell griffiths

[Russell griffiths]

Pole plate for roof rafters. The metal straps sticking out are restraint straps, embedded into concrete core. 

Wall plate for roof rafters. 

 

[Vijay]

2 hours ago, Mr Punter said:

Using Polarwall I replaced the inside XPS with 10 x 2 timber with coach screws at 400 ctrs facing the core. Screwed them in about 40mm deep with an impact driver so there was 60mm cast in the concrete core. We later used face fix joist hangers.

 

I think we went with 10mm coach screws.

 

https://www.screwfix.com/p/turbocoach-coach-screws-yellow-zinc-plated-10-x-100mm-50-pack/89717

 

I'm Polarwall too but thought I had to use J anchor bolts. Coach screws would certainly be easier. I could swear I read somewhere that it was every 1500, but as you said, even at every 400, coach bolts are cheap. Did you use them for the roof plate too?

Edited August 26, 2019 by Vijay

[Vijay]

1 hour ago, Russell griffiths said:

For roof hold down 12mm spaced at 1200mm

for first floor pole plate 16mm spaced either side of hangers, very over kill but they don’t cost a lot. 

 

First floor. 

 

Bolts or J anchors?

[Vijay]

59 minutes ago, Russell griffiths said:

Pole plate for roof rafters. The metal straps sticking out are restraint straps, embedded into concrete core. 

Wall plate for roof rafters. 

 

What did you use to the wall plate for the roof rafters, J anchor bolts?

[Mr Punter]

25 minutes ago, Vijay said:

 

I'm Polarwall too but thought I had to use J anchor bolts. Coach screws would certainly be easier. I could swear I read somewhere that it was every 1500, but as you said, even at every 400, coach bolts are cheap. Did you use them for the roof plate too?

 

Looking at the pic they could have been 600 ctrs?  Was a while ago now. It looks like 1 for every 2 plastic ICF ties. Not for roof plate as we only did ICF for the basement and went timber frame above.

 

[Russell griffiths]

What did you use to the wall plate for the roof rafters, J anchor bolts?

 

not really sure what you mean by this @Vijay

[Vijay]

15 hours ago, Russell griffiths said:

What did you use to the wall plate for the roof rafters, J anchor bolts?

 

not really sure what you mean by this @Vijay

 

Are the parts circled the straps you mentioned, as they look like bolts? 

[Russell griffiths]

Nope, the thing circled is a 12mm anchor stud, with an additional nut on the bottom instead of the J. 

in this pic you can see a flat strap on top of the pole plate, this is 40mm wide by 1.5mm thick it is embedded into the concrete core, I think you will only need this on a mono pitch with no ceiling rafters like mine as it is there to prevent spread.