Carport building - offset pillars, SCAFFOLDERS ??

[grizz]

Any carport builders out there ?

So for the clever engineering and applied geometry types out there.

I am sure this is not a difficult thing, and if you add in CAD then even easier.

Right....... I will try explain and hope it makes abstract sense to some of you.

Simply put, I want to build an approximately 5 meter Long by 6 meter Wide carport, in front of and to the right of my existing garage.

Part of the 5 meter “depth” has to overhang the existing garage door without impairing its opening

Then........ I have a woodwork shed, built on a 200mm high plinth, and also slightly taller than average where the 5 meter side, away from the garage wall, needs to overhang the shed roof, while allowing a sloping drop off for rain and melting snow that tapers from the entrance side. It also faces into the majority of our wind and rain direction at that low end.

I want the 6 meter wide front end and entrance span to be as non intrusive as possible, so uprights need to be against the sides of the overall area.

Which means a potential upright support pillar at 4 meters against the garage front gable wall between the doors, leaving as much as a meter overhanging at about 2.6 meter or 8’6” off the floor and supported from an upright post with cantilevered support outward. Make any sense yet?

Right.

The rear post, next to the woodwork shed is near 5 meters from the garage rear corner, but needs to still overhang the shed to create the 6 meter width that I am looking to create.

Out at the front of the carport, the 4th upright pillar is going to be about where the brick red colour wall is at the moment, that wall plus the grey wall are all coming down and the wall is getting rebuilt about where the red wall is now, including post no 4 the front one, which is at 6 meters from the garage.

I am happy with a short lifespan roofing solution of ply and glued down felt roofing which one would hope will make 8 years before needing replacement.


So......

How do I address the weird geometry on two planes as well as ensuring the energy/mass transfer is done sensibly?


Amateur plan drawing.





Idea of where the posts would go, showing offset and set back.








Let the fun begin.

[slater]

I cant see any problem with that as long as the roof isnt too floppy. You want to make it with fairly deep joists, not just 4x2

I assume one side can be attached to the garage wall too? That will help take some load and triangulate obviously.

[grizz]

Jun 12, 2020 8:41:10 GMT slater said:

I cant see any problem with that as long as the roof isnt too floppy. You want to make it with fairly deep joists, not just 4x2

I assume one side can be attached to the garage wall too? That will help take some load and triangulate obviously.

Thanks slater

I have been looking, thinking, talking and wondering......

Scaffolding with roof sheeting attached?

And yes, I believe a wall plate is possible.

[grizz]

Continuing on this path the carport construction enlightenment I thought it worthwhile asking about using some Aluminium scaffolding


I was thinking a tapered structure, or flat structure, but mounted on a slope.



Covered in industrial profile sheet metal roofing materials.



Once again, I like the idea of lightweight construction and also premanufactured Layher Alloy Lattice beam supports.

Any scaffolders on here know more ?

[1430MK1]

If you wanted to keep it all wood you could use a couple of metal web floor beams.

engineeredsolutions.howarth-timber.co.uk/products/metal-web-joists

You’ll probably find some left over ones on eBay

[Deleted]

Rian - For you final roof covering why don't you look at metal clad roofing - its available in long lengths and will be a one stop solution rather faffing with ply & roofing felt - its also lighter to handle & lighter in weight - just remember that in 8 - 10 years time when it requires replacing that you are also 8 - 10 years older and although you think nothing of the hard work now - it might be a different picture in the future - I have seen Z profile steel used for the frames similar to the ones in the link below - at 6 metre lengths they cost about £38 each - I would have thought this has good advantages over timber and there is a complete system for fastening / joining them - I know we all don't want to spend anymore money than we need to but I would advocate a policy of do it once & future proof it - even if its going cost a little more than your original budget

www.cladco.co.uk/z-purlins/175mm-z-purlins

[filmidget]

Quick and dirty AutoCAD sketch:




The intent is to show a general layout plan and elevation, with a few assumed dimensions.

Unfortunately I have omitted to show the angle of the roof (and it's late and have just shut down the CAD machine), but that's easy enough to adjust anyway.

I had assumed a wall plate, as also suggested by Slater.

That any use?

[slater]

One thing of note. don't underestimate the tendency of roofs like this to want to take off in high winds! It wont make much difference to the structual design of it as such, just make sure its bolted down! Gravity isnt enough 🙂

[grizz]

Jun 14, 2020 7:18:21 GMT 1430MK1 said:

If you wanted to keep it all wood you could use a couple of metal web floor beams.

engineeredsolutions.howarth-timber.co.uk/products/metal-web-joists

You’ll probably find some left over ones on eBay

Thanks

Jun 14, 2020 8:40:25 GMT @grumpynorthener said:

Rian - For you final roof covering why don't you look at metal clad roofing - its available in long lengths and will be a one stop solution rather faffing with ply & roofing felt - its also lighter to handle & lighter in weight - just remember that in 8 - 10 years time when it requires replacing that you are also 8 - 10 years older and although you think nothing of the hard work now - it might be a different picture in the future - I have seen Z profile steel used for the frames similar to the ones in the link below - at 6 metre lengths they cost about £38 each - I would have thought this has good advantages over timber and there is a complete system for fastening / joining them - I know we all don't want to spend anymore money than we need to but I would advocate a policy of do it once & future proof it - even if its going cost a little more than your original budget

www.cladco.co.uk/z-purlins/175mm-z-purlins

Thanks Chris.

Jun 14, 2020 21:24:20 GMT filmidget said:

Quick and dirty AutoCAD sketch:




The intent is to show a general layout plan and elevation, with a few assumed dimensions.

Unfortunately I have omitted to show the angle of the roof (and it's late and have just shut down the CAD machine), but that's easy enough to adjust anyway.

I had assumed a wall plate, as also suggested by Slater.

That any use?

Absolutely, thank you.

Jun 15, 2020 19:48:17 GMT slater said:

One thing of note. don't underestimate the tendency of roofs like this to want to take off in high winds! It wont make much difference to the structual design of it as such, just make sure its bolted down! Gravity isnt enough 🙂

Slater, you are t[right, they become like parachutes with wind, and wind is destructive.


Thanks guys,

Sorry,I have been and still continue to be a bit busy and occupied at work.

I will be combining various parts of the advice you all brought.

[nukelaars]

What size posts are you planning on using? The ones in the photo look like 3" as far as I can tell. I only ever use 4" soaked in preservative, 3" become too weak too quickly with a nominal amount of rot.

[filmidget]

You are welcome.

BTW the sketch shows a 5 degree slope to the roof.

When you decide on the actual construction materials/details I can adjust the drawing to suit if it helps.

[Deleted]

Rian - I was up at my paint suppliers yesterday and took this pick of their roof covering / span



All on insulated roofing sheet (but you don't require insulated) but also on lightweight steel Z beams over what looks to be a 9 metre span

[OAY842F]

I'll second GN's metal sheet suggestion. I re-roofed our shed with it, and certainly don't miss the battle to keep the felt on in high winds - haven't had to touch it in the 3 years since it's been on. The shed is situated where it's very exposed to autumn and winter gales blowing in off the Irish Sea. Felting was most years, or every couple at best before.