This might be a bit different as they are on an angle, but used as a beam it would not help. Just get 2x8s. Just get 2x8's. There will be plenty of other projects to use the 2x4's on. Just Member Posted: 4 Mar Reply If one 2x4 is strong enough and all you need is space for more insulation then cut some chipboard strips and scab two two by fours together you could leaves space between them for even more insulation.
Don't need extra strength, just more room for insulation. I like the idea of scabbing them together with chipboard or plywood. At least then you won't have to scab them together. Search Small Cabin Site:. Posted: 4 Mar Reply In the process of building a small bunkie in the spring. Posted: 4 Mar - Edited by: snobdds Reply One thing I have learned over the years about utilizing used material is Posted: 4 Mar Reply snobdds Thank you for your opinion.
Brettny Member. Posted: 4 Mar - Edited by: Brettny Reply If you only want to add another 2x4 for the insulation depth stacking them should be fine. Posted: 4 Mar Reply The discussion on keyed beams that was had recently might come into play here. Posted: 4 Mar Reply It's going to be more trouble than it's worth unless you make roof trusses with them. Just Member. Posted: 4 Mar Reply If one 2x4 is strong enough and all you need is space for more insulation then cut some chipboard strips and scab two two by fours together you could leaves space between them for even more insulation.
Posted: 4 Mar Reply Yes, one 2x4 is strong enough, 6 foot span. ICC Member. Posted: 4 Mar Reply Quoting: kittysmitty The Canadian National Building code shows that 2x4 meet code requirements for my spacing, spans and snow load. So what type of ceiling is planned?
Will the insulation be spaced down from the roof sheathing to provide ventilation, or what? If the Canadian code states the 2x4 have the strength for the span and snow load situation what amount of insulation is required for their energy conservation code? That does nothing at all to address the OP question regarding increasing the amount of insulation.
Well snobdds, looks like you didnt even make a dent. My dad said something about penny wise and pound foolish or tripping over a dollar to pick up a nickel. Also Know, how much weight can roof trusses support? Typical Loads If the bottom chord of a roof truss functions as a floor joist, such as in an attic room, it carries a live load that also varies by use, but a typical live floor load for a residential space is about 40 pounds per square foot.
The coup roof is good for about 20psf but would not spend much time mid span. If you intend to sister every second then it would be a sure thing if you just used 2x4's 12" ctrs.
The 2x4 strapping will help the rafters to work together. Fine Homebuilding notes that 2-inch by 6-inch garage joists will support a weight of up to 50 pounds per square foot. If you overload your garage's ceiling joists , the ceiling may appear to sag from the strain. While your 2-inch by 6-inch joists can collapse from too much weight , such a scenario is uncommon. Should I use 2x4 or 2x6 for roof? As small as it is 2x4 on 16 centers would be fine.
Use a 2x6 for the ridge. If you plan to tie the roof together, 2x4's would work. Can a 2x4 span 10 feet? Generally, 2x4s can extend for up to 20 feet, but a number of issues have to be considered.
For instance, the 2x4 would not noticeably sag under its weight at 10 feet. How far can a 2x6 Rafter span without support? The table states that 2 X 6 rafters spaced 16 inches on center o. Another option are 2 X 8 rafters spaced 24 inches o. What size lumber can span 20 feet? Corrugated metal roofing. I'd like to use 2x4 rafters on 16" centers with 2x4 strapping on top to screw the metal to.
Some snow load here. Will that work? Allegheny Co. What is the roof snow requirement in your area? I think I would go 2x6 16"oc and sleep well knowing your wife's chickens are safe. Terry : I was thinking off the top of my head maybe 6 or 8 feet would be ok for 2x4 span. Arsenal of Scrappers. The things you can do to increase load capacity: Increase depth of member. Reduce spacing of members. Reduce span of members.
Increase strength of members by choice of stronger species and higher grade. Increase pitch. Buy a snow rake and use it. Thanks for the suggestions everyone. I decided that I would sister every other rafter so every other rafter is a double 2x4 on 16" centers. I'll be laying perpendicular 2x4's flat on 16" centers to screw the corrugated roofing to. Surely that will be enough support.
The coop is separate from the attached run. The coop is 9x8. The run is 9x The run is an outdoor area where the chickens are secure and under roof but can forage and do what chickens do. The coop is an extension of my compressor room on the back of my shop.
The whole chicken extravaganza borders our raised bed garden. Chickens will have no access to the garden. They do have a sq. I had a fence company do the 8' privacy fence that forms the chicken yard.
It connects with my storage building and parking area behind my shop. Here's the 9' section of privacy fence that will become the west end of the run and the angled gate connecting the storage building so I have access to the implement storage area.
I cheated and had the fence guys set all the posts for the run while they were here. I began the rest of the framing today.
Here's some pics of where I stopped today for reference. Back to get more 2x4's tomorrow and continue on Monday Coop before the run construction And here's how far I got on the run today.. Last edited: May 28, Joined Nov 11, Messages 13, Go for it! What is the worst case scenario? Some cold chickens?
Click to expand Joined Apr 22, Messages Just for the heck of it the snow loads for Fayetteville AR is also 20 psf. If the walls are 2x4 then the clear span from inside wall to inside wall is 8'-5". It really depends on the grade of wood but the most conservative in the table is eastern spruce at 8'-7".
The span in the table is for a pitch but the span is the horizontal measurement. The rafter length at pitch would be longer but its structural length is the horizontal measurement if that makes sense. The coup roof is good for about 20psf but would not spend much time mid span. If you intend to sister every second then it would be a sure thing if you just used 2x4's 12" ctrs. The 2x4 strapping will help the rafters to work together.
Looking at the Lafayette info the winds are one to watch. If you do get a excess snow then you could pull it off. The 12" ctrs will make it feel better to work on. Last edited: May 29, Joined Dec 2, Messages
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