FIsh house roof trusses

[Dozer]

Getting to the point on my build I need to decide what to do for the roof. It will be 3/8 plywood with rubber roofing over it but I can't decide what to do for trusses. I see alot of them just have 2/4s with a flat roof. My concern is if those 2/4s bow at all there will be standing water if the house is setting perfeclty level. Im thinking about taking 2/6s and ripping a peek to them. They would be 5 1/2" in the center and 3 1/2" on the ends. The house will also have a roof top ac unit and at least one roof vent (it will be a camper in the summer). Im thinking of doubling up trusses front and rear of the ac unit.

What does everybody else do on there houses? Hoping for your thoughts Lip-Ripper!

[kevfish1]

I used a 2x4 and ripped them down slightly so they had a peek. But I have thought...... When will it ever sit completely level. I bet you would have to work really hard to ever get it to sit completely level.

[OptimusPrime]

I built an 8X16 a few years back. Same thing you are doing with a rubber roof. I framed mine up flat and then screwed one 14ft 2X4 right down the top of the roof in the middle laying on its side. I then attached the plywood. It will give you just enough of a dome shape to push water off the sides when it melts/rains. I have had no issues with bowing either. Use the metal 2X4 holders for extra support on your roof studs. Good luck.

[Hawg]

I've always done the ripped down boards, 1x4's always worked on 6 ft widths, but I'm thinking my new one will be flat. I have an 8 x 40 ft old mobile home for a hunting camp thats flat and very seldom ever have any water on the rubber roof at all. I think the black rubber evaporates water fast.

[redhooks]

Mine is 2x4 flat w rubber, as mentioned I don't think its ever really flat and the wind and sun seem to take care of it although I move once a week for the holes.

[icctolson]

couldn't you just build 1 side of your house 3" - 6" higher than the other side if your worried about water pooling on top.

[Dozer]

couldn't you just build 1 side of your house 3" - 6" higher than the other side if your worried about water pooling on top.

That would deffinetly be the easiest! I dont think it would look very good though.

I think Im going to build it flat and raise the areas around the AC and roof vent 3/4". If I build it flat I will have 2" of clearance to get it in and out of my shop until I put on the AC and vent on!

[fishkins]

Im thinking about taking 2/6s and ripping a peek to them. They would be 5 1/2" in the center and 3 1/2" on the ends.

That's exactly what I would do!

[jerkbait]

X2.

[Lip_Ripper Guy]

It seems like about half the people rip down 2x6's, and half do flat 2x4's. I've always done flat and never had a problem.

[hovermn]

What I like about ripped 2X6's is that you have more meat on the bone at the center to cut a hole for all of your electrical. Been doing it this way for 10 yrs with great results.

[Dozer]

I decided to just use 2X4s flat 16" on center. Im going to double them up in front and rear of the A/C unit as soon as I figure out where that is going to be.