Long/reinforced roof joist options
- Thread starter d000hg
- Start date
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First id ask for roof truss triangles B and D to have joists ( marked in blue )bolted onto the side of them in 225cm x 72cm timber. Then joist hangers used to support span for joists from X to X . Roof truss C can then be incorporated into the 2 joists.
If that upper triangle (“truss”) were in one piece, it would be a VERY strong beam. You can probably make the individual timbers act together (as though they were a single piece) by nailing or bolting sheets of plywood on both sides. Should be an easy calculation for a structural engineer, and potentially a very cheap modification to the design.
L
Leofric
Can I repeat some comments made previously by me and others :-
Yes, but who is dealing with the local authority building control
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I've already explained that they have made an error/miscommunication in their design but it is already in manufacturing and might be outside their normal construction process.
I've also said we've made it clear it's an error and are waiting on their response, but looking into alternatives should they be required.
Re: BC we have just appointed the council and are currently liaising with them. But so far as just sent them the information we have and are waiting for them to get back to us before deciding how to proceed
I've also said we've made it clear it's an error and are waiting on their response, but looking into alternatives should they be required.
Re: BC we have just appointed the council and are currently liaising with them. But so far as just sent them the information we have and are waiting for them to get back to us before deciding how to proceed
L
Leofric
Re bldg. control, have you submitted a Full Plans Submission for bldg. regs approval or doing the work under a Building Notice
You make it all sound rather confusing and mysterious ,I can't believe I have submitted so many building regulations applications
If you are making amendments to the structural design these will have to be designed by a structural engineer anyway for bldg. regs approval.
Building control don't design it for you.
You make it all sound rather confusing and mysterious ,I can't believe I have submitted so many building regulations applications
If you are making amendments to the structural design these will have to be designed by a structural engineer anyway for bldg. regs approval.
Building control don't design it for you.
Sorry been away. How you getting on.
Still waiting on the manufacturer for an update. We've spoken to a couple of people who work in the building trade and they all seemed to think it was an easy problem to solve given the light-weight design of the building - doing something along the lines of what you suggest most likely. Which doesn't stop it being frustrating but is at least reassuring.
Yes can imagine it's getting annoying. You should be ok as it not a heavy roof material. Had i nosy on some sites and by what i can gather it looks like the company are sandwiching two of their existing designs together. Thats where the pillar has come from. Truss C would of been both cabins outer walls if you get my drift.
I've been reviewing the specs in more detail, since those plans are the actual design/construction plans showing every numbered piece of wood.
I've colour-coded to show how some logs are single pieces, and others are two pieces:
So wall C, the bottom 3 planks are split where they rest on the pillar, interleaving with wall 3.
On the other hand, as you can see in wall 3 the lengths are a single span running from walls B-D, pieces 008 and 016 both being over 5m long:
This makes me wonder if the upright is really needed in the first place - there are 7 logs of this length all stacked which is a massive timber if treated as one piece. Again, I will be asking an engineer but I'm wondering if those pieces can be bound together to form a super-member rather than being stacked.
In the meantime we're still chasing the manufacturer but they have been slow to respond, and have now informed us it has been built and shipped to the UK. The timing makes me cynical that they've deliberately not answered our questions so they can ship the thing and say "well, it's done now".
This seems to suggest getting them to address the design is now difficult without a significant delay which we cannot afford, so how would people proceed in that situation? They will not ship it to us until payment is completed so would you lot demand a price reduction to allow for making changes? Or what?
I've colour-coded to show how some logs are single pieces, and others are two pieces:
So wall C, the bottom 3 planks are split where they rest on the pillar, interleaving with wall 3.
On the other hand, as you can see in wall 3 the lengths are a single span running from walls B-D, pieces 008 and 016 both being over 5m long:
This makes me wonder if the upright is really needed in the first place - there are 7 logs of this length all stacked which is a massive timber if treated as one piece. Again, I will be asking an engineer but I'm wondering if those pieces can be bound together to form a super-member rather than being stacked.
In the meantime we're still chasing the manufacturer but they have been slow to respond, and have now informed us it has been built and shipped to the UK. The timing makes me cynical that they've deliberately not answered our questions so they can ship the thing and say "well, it's done now".
This seems to suggest getting them to address the design is now difficult without a significant delay which we cannot afford, so how would people proceed in that situation? They will not ship it to us until payment is completed so would you lot demand a price reduction to allow for making changes? Or what?
Hi Again. Now that seems about right. Ignore until ready to ship. Yes i'd be asking for a discount so you can alter the design while being built. With it being a company from outside the UK i think they will decline. I'd myself be asking advice from a consumer group regarding your rights as well. Not sure if i right or not but you making the last payment means that the are happy and argee with the product that you buying. Check the small print on contract for details.
The 2 bottom lengths depending on size could be replaced by 1 joist/beam so it built into the structure rather than doing at a later stage. Are you building it yourself on arrival.
The 2 bottom lengths depending on size could be replaced by 1 joist/beam so it built into the structure rather than doing at a later stage. Are you building it yourself on arrival.
In a perfect world, we'd not have those solid 'partitions' above ceiling height as they break up the open space somewhat. If we're going to make modifications I was wondering if we could simply remove the load-bearing part B-D (blue & green) above, and remove the 'solid truss' in wall C, and commission something like this which I just happened to see on a timber-engineering company's homepage:
At a guess that span is not dissimilar to ours though the pitch angle is different. But it's rather attractive. I'd love to get a ball-park idea on what that might cost, since it's certainly not a standard spec truss. I've messaged them.
We've made some progress with the manufacturer acknowledging fault on this issue, since it has already shipped to the UK they've agreed with our suggestion that reducing the price to acknowledge required changes is simplest.
We're talking with a structural engineer, you'll all be glad to know, but it's nice to have preferences for him to look at. I suppose I'm proposing along the lines:
Not sure how the over-sized purlins (almost 6x3") would join onto that but presumably a smaller detail.
At a guess that span is not dissimilar to ours though the pitch angle is different. But it's rather attractive. I'd love to get a ball-park idea on what that might cost, since it's certainly not a standard spec truss. I've messaged them.
We've made some progress with the manufacturer acknowledging fault on this issue, since it has already shipped to the UK they've agreed with our suggestion that reducing the price to acknowledge required changes is simplest.
We're talking with a structural engineer, you'll all be glad to know, but it's nice to have preferences for him to look at. I suppose I'm proposing along the lines:
Not sure how the over-sized purlins (almost 6x3") would join onto that but presumably a smaller detail.
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Try this website for a guide price:
https://www.donaldsontimberengineering.co.uk/instant-quote/
https://www.donaldsontimberengineering.co.uk/instant-quote/
Hi Again. With that sort of truss with the right calcutlation by a structural engineer you won't need the additional joists adding.
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