Please post a drawing on what you doing.

Dave

 

View attachment Screen Shot 2021-11-17 at 11.52.34 PM.jpg

The black lines are the columns and are 10' apart - square. They are 2-7/8" oilfield pipe concreted in the ground 4'.

The red lines are what I am wondering would be the best. They will be welded to the pipe columns on each end and span 10'.

All the cross pieces in yellow will be 14 gauge C purlin spanning 10' and welded to the red pieces. No yellow pieces touch the pipe columns.

Normal 2x6's will be screwed down on top of the purlins running perpendicular to them.

My question is it seems lots of people use receiver channel https://www.hootensteel.com/searchresults.asp?cat=3469 and just slide their c purlins into it and weld or screw them together. The receiver channel looks flimsy to me like it is significantly weaker than a C purlin. Using the receiver channel to carry the entire weight of all the C purlins seems like asking a lot of them.

 

View attachment porch.jpg

Basically what I am building will be a lot like this except entirely out of steel except for the 2x6 boards used for the deck you walk on. All framing will be steel.

 

agreed what there telling u dont sound right, but u aint building/spanning much either. i'm sure theres charts giving weight load according to span for those. , its just 10 x10 if im understanding it right, i mean in those hurricane countries, they do it outa bambboo and there alright. i guess if it makes u sleep better, u could cut a length of channel iron in half, weld some clips on, bolt ur purlins to clips. i dont think id prefer to weld ends of purlins, but might be ok in this minerature project

 

I've probably built over 60 buildings using the receiver channel and it certainly has it's place. My own carport is built that way. However, I don't think it's strong enough to use for the floor supports even being only 10'. It would be fine for the roof unless you have a serious snow load to deal with. A very nice looking roof framing is 2x6x14ga. rectangular tubing. Metal building suppliers are the only ones that have that big of rec tubing in that wall thickness around here. When I use it, I run the tubing that works as the purlins, across the top of the tubing that acts as the rafters. You need to weld little pieces of angle in the ends of the tube so you can screw the trim down and close the tubing ends.

 

I use 2½ X 2½ X ¼ angle iron about 4½ long

Dave

 

So would something like 8" 11.5# channel be good for the main beams and 8" c purlins for the joists on the deck?

I think 6" channel and 6" purlins wold be fine for the roof?

 

I have 8 inch 14ga channel and 8 14ga inch purlins on a 25ft x 25ft span on my carport roof & they're doing great, even survived a tornado over the summer with no issues. I don't recall what spacing I used on the purlins. Your steel supplier should be able to help with strength/size requirements.

 

Thanks. I am not so worried about the roof. They have tons of charts for that and there are standard sizes that are used based on the span. What concerns me is the floor. What if I have 4 big guys moving a 1,000 lb gun safe into the house on the deck.

 

Use engineered floor joists. They have tables/charts for those.

https://www.the-house-plans-guide.com/joist-span-tables.html.

An 11-7\8" joist on 16" center will easily carry your 4 guys and safe. Better than your trailer floor.

 

An 11-7\8" joist on 16" center will easily carry your 4 guys and safe. Better than your trailer floor.

thats what i was thinkin about the mobile home floor. its old, so its probaably better than the new ones. on the other hand,if u can get it in somehow, it might be nice that porch wont hold safe, that way 4 guys dont carry it out

 

Heres a link for tables using metal framing for floor joists


https://online.flippingbook.com/view/163545/73/

 

Bdog, this how I would do your 10'x10' roof.

Pic is approx 4'x4'. 20 gauge. 3/8" studs/purlins with 20 gauge hat channel Tin roof gauge is like 25gauge? Lag bolted to would thru stucco. I forget the slope but you need better than 2%.

If you have 14 gauge purlins for the floor then use them at your discretion. Use a bearing support tho.