Is my over hang designed properly?

Not enough information. Using 6 posts I see 8' between posts on the

If you need a building permit, draw your plans out and take them in. They will quite rapidly tell you if you are up to code. Of course the drawback is that you will wind up building way beyond what you consider adequate. In my case, for a 26x10' shed roof, had I built to their specs I could have parked a D6 cat on it.

Harry K

I was thinking of running 2x6s along the front and back to hold up the raftres. I was thinking 4 12 foot 2x6. One on each side of the 4x4 with a seam in the middle of the structure. I am not sure I want to mess with getting a permit. But, unless I feel real comfortable witht he information I get I will go that route.

Also what should the pitch on the roof be at a minimum?

Your plan is not sound. First, you need to know the recommended snow load for your area. I doubt that it is a very high figure in Maryland, so let's use some common minimums for example, 10 psf dead load and 20 psf live (snow) load.

You won't even come close to spanning 18' using 2x8's on 16" centers, let alone

And your cross members along the 18' edge would need to be quite substantial to span 8', they would require double 2x12's at least in my area.

Here is an online span calculator to play around with some figures:

Dennis

NO You need to contact your building department. Your design does not take into consideration, wind loading, and snow loading. I will bet you will end up with more like 2x10's 16" on center.

I built a patio cover, 12 feet wide by 14 feet long, 3/8 ply and rolled roofing. I need 1 4x6 post and a beam pocket attached to the house. I needed a 4x

i doubt if you will get a permit once you check and find out that you need a fabulous drawing (like a blueprint) and that you will have to build so it will last thru 100 year-storms.

since it's only to cover a trailer, it might now matter if a hurricane wind blows it away or collapses it. but i would listen intently to the advice you're getting and check those spans. bigger is better. bear in mind that a housing inspector might make you take it down so build it with bolts that you can remove if you have to. ....thehick

May not need blue prints. Many departments will accept well drawn plans done by home-owners. Mine will. They do need to be -well- drawn and require detail drawings of how you are going to frame corners, doors, etc. Must also have all construction materials specified as to size/type etc.

Harry K