Construction Question, Shed... Slope of Flat Roof

[ndemge]

Building a Shed, 16X30<br /><br />Plan to have a Flat Roof<br /><br />How much of a slope does it need to have?<br />Live in St. Louis<br />Metal Roof

 

[sangerwaker]

Re: Construction Question, Shed... Slope of Flat Roof

Personally, I would want at least a 3/12 to keep the rain and a lot of the snow off. I just don't like the idea of water being able to pool. Besides, think about the snow load. We all (well, most of us anyway) know how heavy a good dumping of wet snow can be. I wouldn't want to worry about it if I was out of town for a couple of weeks.<br /><br />Then again, I am not sure how much snow you get in St Louis.

 

[Hotrods]

Re: Construction Question, Shed... Slope of Flat Roof

MAke sure you use the rubber membrain. not shingels

 

[steve n carol]

Re: Construction Question, Shed... Slope of Flat Roof

have you thought about not having a ridge? just one side that's higher than the other 3? take to heart what sanger said about snow loads...sl

 

[starrider_68]

Re: Construction Question, Shed... Slope of Flat Roof

Being from just north of St. louie I highly reccommend you to put at least a gable roof on your shed...you can use that space to "store "your seasonal items out of the way. But if your interested you can go as low as 2/12 pitch as long as you have rafter spacing of 16" to handle the 75lb. per sq. ft. load requirements of missouri.

 

[Barlow]

Re: Construction Question, Shed... Slope of Flat Roof

ndemge- is the flat roof a design constraint with the other houses/buildings near it?<br /><br />starrider_68- member spacing plays a role in correct/allowable loads but, its ultimately the members dimensions (H/W/L), species (if specifiing dimensional lumber), type of material such as dimensional, I-joists, LVL, LSL, and PSL.<br /><br /> Then the system(s) used either being rafter, joist or truss and then sheathing type and thickness or the use of purlins and/or both that determine the allowable/sufficient member criterea and spacings.<br /><br /> As for snow loads - " 75psf " is over twice as much allowed usually in the snow regions of the country with 30psf 'live' and 12-15psf 'dead' being the norm.... according to BOCA, UBC, and SBCCI guidelines.. <br /><br />pardon ...this is what i do for a living.