BBQ Hut/Shelter

Class MayDresser · 12-05-2020 01:45PM

Is that a 6' cavity block under the boxes of screws? Never knew they could be got.
You're getting the weather for it anyways, same as RobaMerc over in the other thread!

oleras · 12-05-2020 08:49PM

Lumen wrote: »

What's the plan for the roof? It is going to be covered or open? Right now it seems like you're aiming for a brise soleil.

Covered, will be using clear corrugated roof sheets.

Left that one post attached and started again this morning, weather was perfect.

Done my tits in but got it all square and bolted the other supports to the concrete.

Felt like cheating using joist hangers, but they were perfect, doing it on my own and being able to just sit one end in and then the other...no messing with ladders as supports !

A lot of plans on bits of paper to get me this far, and if i do say so myself, it doesnt look too shabby. Purlins, roof and sides the weekend hopefully.

As for the purlin spacing, to add shade, i have 10, will get more if i go for close together, so spaced them out both close together and far away, tbh, with the clear roof, it seems much of much, the 2 different colors seems to be the feature in the pic above.

Still have a few 4x4 to attach, one to the mid left section and possibly 2 tot he fron, depending on what kind of opening i decide on.

Im not sure whats up with the pic quality, looks like they were taken with a potato.

oleras · 12-05-2020 08:51PM

beertons wrote: »

Were you pumping up the leaf blower in the first pic?

Only kidding, I'm jealous.

Yeah..using a foot pump to clean out the holes...then i realise i have a blower...thats what weekend nights does to the head...:pac:

Rows Grower · 12-05-2020 08:53PM

Very nice work and you're making progress at a great rate, fair play.

Lumen · 12-05-2020 09:01PM

Framing is so much fun!

GreeBo · 12-05-2020 10:55PM

Looks well so far, well done.

What screws are in the hangers? Are they structural or just decking screws?
Typically you'd nail them in for shear strength (nails will bend, ordinary screws will break)
You won't have much weight (until someone climbs up there!) But uplift could come into play, depending on how well you fix the roof sheeting...

oleras · 12-05-2020 11:06PM

GreeBo wrote: »

Looks well so far, well done.

What screws are in the hangers? Are they structural or just decking screws?
Typically you'd nail them in for shear strength (nails will bend, ordinary screws will break)
You won't have much weight (until someone climbs up there!) But uplift could come into play, depending on how well you fix the roof sheeting...

TBH the screws in the hangers are just to hold them in place, not relying on them for structure. I have 2 100mm screws driven in from the front plate into the joists front and rear, now that you mention the nails, i could also drive a few in through the faceplate just to be sure.

faceplate: im sure there is a proper name for that, im using it wrong.

GreeBo · 13-05-2020 12:10AM

oleras wrote: »

TBH the screws in the hangers are just to hold them in place, not relying on them for structure. I have 2 100mm screws driven in from the front plate into the joists front and rear, now that you mention the nails, i could also drive a few in through the faceplate just to be sure.

faceplate: im sure there is a proper name for that, im using ig

You have a ledger board at the house end and a beam at the other.
What sort of screws are they?
Screws are really designed to stop things being pulled apart or grip strength (which nails are bad at unless you nail them at different angles to the plane and each other)

Because of the threads screws have lower shear strength since they are comparatively narrower, unless you are using structural screws.
You can see this if you have ever had the head of a screw come right off when you hit a knot for example, especially with a plasterboard screw.

Otherwise use coach screws, but they will be a pain in the ass on joists.

Something like below, 2 per end per hoist would be ideal imo
https://www.tcfixings.co.uk/main/product/productinfo/3281/TIMco-Wafer-Head-Index-Screws-6.7x125mm--Ea-/1

Lumen · 13-05-2020 12:55AM

Snow load might be 100kg/sqm so 2 tonnes plus another few hundred for the roof structure.

All of that load is going through the corner fixings, because the edge rafters are not sitting on the posts.

So I would use stainless coach screws at the corners for peace of mind.

You must not have the roof held up by fixings that can corrode.

Plus diagonal bracing and nail the joist hangers properly, to spec.

Mellor · 13-05-2020 05:18AM

oleras wrote: »

TBH the screws in the hangers are just to hold them in place, not relying on them for structure. I have 2 100mm screws driven in from the front plate into the joists front and rear, now that you mention the nails, i could also drive a few in through the faceplate just to be sure.

as mentioned, nails are better than screws as they'll deform under load rather than snap. If the screw are big enough they'll hold the joists, but two nails in each now would be good.

For the posts, Screws are fine if the posts were notched for the beams. That way the posts takes the weight and there's no shear load on the screw, it's just holding them together (as screws should). But with them face fixed, the whole roof is loading to to a few screws in shear.

Adjusting post is probably not an option. But a couple of bolts on the main beams would be easy enough now (nail the joist closed to the house).

faceplate: im sure there is a proper name for that, im using it wrong.

Structurally, it's a beam.

GreeBo · 13-05-2020 07:16AM

Lumen wrote: »

Snow load might be 100kg/sqm so 2 tonnes plus another few hundred for the roof structure.

All of that load is going through the corner fixings, because the edge rafters are not sitting on the posts.

So I would use stainless coach screws at the corners for peace of mind.

You must not have the roof held up by fixings that can corrode.

Plus diagonal bracing and nail the joist hangers properly, to spec.

True, I forgot about snow!

oleras · 13-05-2020 09:48AM

Makes sense about the loads on the sides of the posts, i will get bolts and use them on all 4 corners, i will also get the structural screws from the ledger/beam to the joists. Thanks for the info folks.

oleras · 13-05-2020 09:51AM

So thats why people notch the top of the posts and have the beam sit on it, more for engineering than ascetics. Makes perfect sense.

GreeBo · 13-05-2020 09:55AM

oleras wrote: »

So thats why people notch the top of the posts and have the beam sit on it, more for engineering than ascetics. Makes perfect sense.

It does also look nice, but without it you can use the biggest beams and the biggest posts and it all hangs from a couple of screws.

loyatemu · 13-05-2020 10:02AM

could you put 45 degree supports between the posts and the beams? Sorry don't know the engineering term but seems to be a common design for frames like this.

oleras · 13-05-2020 10:06AM

loyatemu wrote: »

could you put 45 degree supports between the posts and the beams? Sorry don't know the engineering term but seems to be a common design for frames like this.

Think its called a brace, thats a good idea !

These the same GreeBo ?

https://www.screwfix.ie/p/timbascrew-wafer-timber-screws-gold-6-7-x-150mm-50-pack/9458j

And these coach bolts ?

https://www.screwfix.ie/p/general-purpose-threaded-coach-bolts-bright-zinc-plated-m12-x-180mm-25-pack/39783

GreeBo · 13-05-2020 10:19AM

oleras wrote: »

Think its called a brace, thats a good idea !

These the same GreeBo ?

https://www.screwfix.ie/p/timbascrew-wafer-timber-screws-gold-6-7-x-150mm-50-pack/9458j

And these coach bolts ?

https://www.screwfix.ie/p/general-purpose-threaded-coach-bolts-bright-zinc-plated-m12-x-180mm-25-pack/39783

They look the same, but I cant find any useful specifications for them...

On the brace, you are going to have the same issues attaching the brace to the post and its more to stiffen and stop the frame from racking rather than transfer load to the post. (which is what you want)

Lumen · 13-05-2020 10:30AM

Stainless carriage bolts (washer and nut one end)
http://www.inox.ie/acatalog/Carriage_Bolt.html

or

Stainless hex bolts (washer both ends, nut one end)
http://www.inox.ie/acatalog/Set_Screw.html

Or you could just use threaded rod with a nut and washer both ends, which has the advantage/that you don't have to measure the length, you just fit it and trim with an angle grinder.

I haven't used any of these, but I have used stainless coach screws and they're beautiful.

oleras · 13-05-2020 10:34AM

I have another 4 posts to go in, i will use the coach bolts to secure those also.

GreeBo · 13-05-2020 10:39AM

Lumen wrote: »

Or you could just use threaded rod with a nut and washer both ends, which has the advantage/that you don't have to measure the length, you just fit it and trim with an angle grinder.

make sure you trim *after* you attach the bolts!!

Cup/Dome headed carriage screws and washers look better than rod and bolts imo, just take the time to make sure they are all used they same way in the same position on each fixing. Nothing worse than having them all at different heights etc.

Mellor · 13-05-2020 12:11PM

Ole,

These are coach screws. Fix directly to timber
https://www.screwfix.ie/p/turbocoach-coach-screws-yellow-zinc-plated-10-x-100mm-50-pack/89717

Alternative is carraige bolts which need to bolt fully through with a nut and washer

oleras · 13-05-2020 12:24PM

Mellor wrote: »

Ole,

These are coach screws. Fix directly to timber
https://www.screwfix.ie/p/turbocoach-coach-screws-yellow-zinc-plated-10-x-100mm-50-pack/89717

Alternative is carraige bolts which need to bolt fully through with a nut and washer

Thinking now, i had planned on using wood screws to attach the purlins to the top of the joists, nails or structural screws shoudl be used i take it ?

Lumen · 13-05-2020 12:40PM

oleras wrote: »

Thinking now, i had planned on using wood screws to attach the purlins to the top of the joists, nails or structural screws shoudl be used i take it ?

Whilst nails are generally better suited for framing, the purlins in this case are mostly aesthetic and will be supported vertically by the joists and laterally by the sheeting, so it doesn't much matter IMO - the fasteners aren't going to be taking much load.

I don't have a nail gun or much skill so would find it easier to throw some screws in than attempting to toe nail with a hammer whilst dangling off the top of a ladder.

Mellor · 13-05-2020 01:16PM

Agree with the above. The screws in that instance are under much lower loads and parallel to the force.

oleras · 13-05-2020 01:27PM

Mellor wrote: »

Agree with the above. The screws in that instance are under much lower loads and parallel to the force.

Since the roof will be attached to the purlins using tec screws, would uplift of the whole roof be a concern when its really only attached with wood screws to the joists, albeit up to 100 screws ?

Lumen · 13-05-2020 01:40PM

oleras wrote: »

Since the roof will be attached to the purlins using tec screws, would uplift of the whole roof be a concern when its really only attached with wood screws to the joists, albeit up to 100 screws ?

No. Screws are great at pulling, and 100 is a lot.

Also, I could be wrong but I think uplift is less of a problem with a flat roof than a gently pitched roof.

The sheeting would probably detach before the frame came apart.

listermint · 13-05-2020 03:12PM

Look it's obvious to me at this point.

Your going to have to explain to the missus how you now need a cordless Hitachi Nail gun.

oleras · 13-05-2020 08:06PM

Going to order these in the morning.

https://www.securallfastenings.ie/product/6-7-x-125mm-wafer-head-screws/

https://www.securallfastenings.ie/product/timco-m10-x-160mm-index-exterior-carriage-bolts/

These look ok for the job ?

Lumen · 13-05-2020 08:15PM

Yep, as long as they're the right length.

Those M10 bolts can probably take a tonne each in shear. Beefy!

oleras · 13-05-2020 08:31PM

Lumen wrote: »

Yep, as long as they're the right length.

Those M10 bolts can probably take a tonne each in shear. Beefy!

Should i go for the M8 ? WRT lenght, post is 90 and beam is 44, so have to cover at least 135mm, could probably go for the 150mm and no trimming required ?

Is the length from the top of the cap or the bottom ?

edit: I see they only have M10, i will go with the 160mm just in case, better to be looking at it than for it.

BBQ Hut/Shelter

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