Rebuilding A Carport

[wanged]

Hey guys just want to know what you think about my idea, im trying to rebuild a carport and want to know if its ok structurally........

To start off i have 6 115mm x 115mm (4.5" x 4.5") at 3 meters long, i will dig down 650mm (25.6"), so i can stick the support beems donw 600mm (23.6") deep, 3 on one side and 3 on the other and the distance between them from center to center will be 5585mm (18.3 ft). The right side postes witch is closes to the house will be 2400mm (7.8 ft) high off the ground, and the other postes will be 2200mm (7.2 ft) high off the ground witch will give me a slight slant away from the house.

Next i will be putting up 3 cross beems 190mm x 45mm x 6000mm (7.5" x 1.8" x 19.7 ft)from one side to another and will be held in with M12 x 130mm (5.2") bolts.

Then will go on the horizontal beems witch i have 14 peaces of 90mm x 45mm x 3000mm (3.5" x 1.8" x 118") and thinking of joining two of them together to make it 6000mm (19.7 ft) witch will sit over the cross beems and will be held in with 75mm (3") square screws.

Last but not lest i will through on polycarbonate greca panels on top.......


I hope i am explaning this as much as i can........any help is better then nothing would love to get intake on this thanks every one

Young

 

[bgarrett]

"any help is better then nothing"

Ok, it kinda looks like you are saying you want to use 4" posts set 2' in the ground
with 2x8x20s supporting 2x4s that are 10 feet long with plastic panels for roofing.

2x8s are not enough, I think 2x12 or add angle braces and 10 feet will just barely allow you to wiggle out of the door of a car. 12' wide is better. 2x4s stood on edge over 10 feet is not enough. I think 2x6 at a minimum. I avoid plastic as much as possible and use a metal roofing that is thicker than the minimum required

 

[wanged]

yeah that right, dont you think its just a bit over kill with the 2x12s and then to add more braces? i though that the 2x8 would be more then enough but if ya think i need more ill have to change alot of things around for the 2x12 to fit on top of the 10ft beems standing up ?
and also another question just want to know why i shouldn't use plastic for the roof ?

 

[bczygan]

First thing........do you live in a place where you can just build anything with no permits or approvals of any kind?
Where is this and what are the rules for zoning and building?
Are plastic roof panels allowed? (Some places don't allow them as they can become a hazard in high winds.
If they are, what is the span, support and fastening the manufacturer recommends?

What is the size of vehicles that will be parked here?
Are you in an area where there is snow?

 

[wanged]

i am in australia and there are permits and approvals that i would have to get if i was building this from strach but i am not, im just taking the old one down and then making the new one better and stronger and more safer. I dont think i have any problems with rebuilding the same width and almost the same hight (just a bit bigger). The plastic roofing is allowed but i have been online to cheak it out all the sheets need to over lap each other by at lest 2 humps so it can be safe.
we dont have sown in australia but we do have some high winds sometimes but all is well..

At the moment the carport is about to fall apart and i just want to knock it down and rebuild it to almost the same spec and just change a little bit of the hight and add a bit of strengthto it.

 

[Charles (in GA)]

Might add your location (Oz ?) in your profile, so it will appear to the left below your name. Makes it easier to figure things out if we have some idea where you live.

Charles

 

[wanged]

sorry new to this site ill do that

 

[bczygan]

OK,
Second thing. This thread is no good without photos!

As far as permits etc. You are probably not in compliance if you rebuild without permits. Usually any structural repair requires them, at least where I am. If you build it any different (Higher, bigger etc.) then you definitely need them. But that is up to you to judge.

The span I am talking about isn't the overlap side to side, but rather, the length between supports. Give us a link to the material.

For the structure. Triangulation is the secret to structure. Braces in all directions does this. Triangulation can also be accomplished within the connections of members to each other. This requires members with some depth and multiple fasteners to avoid creating a hinge.

Again, we need photos of the existing conditions.

 

[fromnwmt]

"any help is better then nothing"

Ok, it kinda looks like you are saying you want to use 4" posts set 2' in the ground
with 2x8x20s supporting 2x4s that are 10 feet long with plastic panels for roofing.

2x8s are not enough, I think 2x12 or add angle braces and 10 feet will just barely allow you to wiggle out of the door of a car. 12' wide is better. 2x4s stood on edge over 10 feet is not enough. I think 2x6 at a minimum. I avoid plastic as much as possible and use a metal roofing that is thicker than the minimum required

Ditto on the 12ft wide I recently finished a pole shed with 10ft bays and i really wish they were 12ft even though its strictly for storing its narrow....

 

[wanged]

I will post some pics up tomorrow and you guys can have a look but i thinkk im going to go with the 2x12 insted of the 2x8.

but just another question just want to know because im not caryying so much weight would 2ft into the ground be enough for that ? and would the size be enough (115mmx115mm) 4x4"