Should I use 2x4 or 2x6 for roof?

Asked By: Herney Hennerici | Last Updated: 5th February, 2020
Category: business and finance construction industry
3.9/5 (1,094 Views . 42 Votes)
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.

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Correspondingly, which is better 2x4 or 2x6?

2x6 walls are bigger than 2x4 walls. They're harder to lift and the headers on exterior walls require more work. Great builders add 2.5 inches of closed-cell foam to the headers over windows and doors to help cut down on energy bills.

Also Know, how far can you span a 2x4 Rafter? Max. Live Load 20 lbs/ft2 (956 N/m2)

Maximum Span (ft - in)
Nominal Size (inches) Rafter Spacing, Center to Center, OC (inches) Lumber Grade
2 x 6 12 16' - 4''
16 14' - 11''
24 13'

Additionally, can I use 2x4 for porch roof?

Use treated 2x4 boards for rafters. Rafters are the supporting framework for a porch roof. They run perpendicular to the house.

Are homes built with 2x4 or 2x6?

Modern conventional home building normally makes use of 2x4 lumber (top line above, second from left) in constructing exterior walls. But 2x6 framing, which is a little more than 1.5 times wider, is a common upgrade and is required by some local building codes.

39 Related Question Answers Found

How do you make a 2x4 wall into a 2x6?

Install 2" Furring Strips
You will need to saw 2x4's down to a 2" width (or whatever is needed) so your finished wall will be 5 1/2 inches, the actual thickness for 2x6 walls. Measure your existing two by fours. In some older homes they will be 3 3/4" or even 4" instead of the 3 1/2" of modern 2x4's.

Can a 2x4 wall support a second story?

Yes..the are millions of two story homes with 2x4 walls on the first floor. That is never an issue even if you use 2x6 walls for the second floornon issue. That's one hurdle out of the way.

What is the actual size of a 2x6?

Same for 1x4, 2x4 and 4x4 etc. Actually, the nominal size is often never the actual size. 1x4 are 3/4″ x 3–1/2″, 2x4 are 1–1/2″ x 3–1/2″. Again, 2x6 are 1–1/2″ x 5–1/2″.

What is the advantage of using 2x6 walls?

But the greater depth of 2x6 construction - the deeper walls - allow a builder to add deeper window wells as part of the home building process. This allows even humble homes to possess charm, adds character, and can do a surprising amount to the feel of a home.

Can you put r19 in 2x4 walls?


R19 in a 2×6 wall does not really give you an R19 wall. It is about a R16 wall because of the feect of the “thermal short circuiting” through the studs. If it is a 6″ steel stud wall, it could be as low as an R11 wall.

How far apart are 2x6 studs?

Wood-framed houses have traditionally been built with 2x4 studs spaced 16-inches on-center. Research has shown exterior framed walls can be adequately supported by 2x6 studs spaced 24-inches on-center.

What is the highest R value for a 2x6 wall?

The installed insulation R-value for 2x6 fiberglass batt ranges between R-19 and R-21. When blown or sprayed cellulose insulation is used, the R-value is typically R-20 for 2x6 walls.

What can I build with 2x6?

2x6 projects
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How far can you span a 2x6 Rafter?

The table states that 2 X 6 rafters spaced 16 inches on center (o.c) can span a maximum distance of 13 feet 5 inches. Another option are 2 X 8 rafters spaced 24 inches o.c.

Can I use 2x4 for rafters?


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. as that is the longer span strength and would use less wood. The 2x4 strapping will help the rafters to work together.

What size lumber can span 20 feet?

Re: 20 foot clearspan beam size
In that case, you need something like a 12-16" GLULAM or LVL to span the 20' and can use simple 2x8-10 dimensional lumber 16"OC as floor joists.

Can you use 2x4 for roof trusses?

Permanent bracing makes the truss component an integral part of the roof and building structure. Bracing members should be 2x4 nailed with two 16d nails at each cross member unless specified otherwise on the design drawing. Lateral braces should be at least 10 feet long.

How do you frame a porch roof?

Measure two 2-by-8 pieces of wood the length of the porch and two 2-by-8 pieces of wood the width of the porch. Add 8 inches (20.3 centimeters) to each measurement for overhang. Cut the pieces of wood. Attach them to each other to make a rectangular frame.

What size wood is used for rafters?

Use these two tables for roof rafters with a slope of 3" in 12" or less.
Nominal Size Spaced (o.c.) Species / Grade ( 20# Live Load - No Finished Ceiling)
2" x 6" 24 12-8
2" x 8" 12 21-7
16 19-6
24 16-8

Can I use pressure treated wood for roof rafters?


Answer: Whether pressure-treated lumber is appropriate for trusses depends on the preservative used in the treatment process. If the lumber treated with waterborne preservatives is kiln dried after treatment, most of the preservative chemicals are inert and normal plates can be used.

How much weight can a 2x4 joist support?

If there is no strong wind, a 2x4 measuring at least 8 feet can support at least 1,000 pounds vertically.

How far can a double 2x6 span without support?

When supporting joists that span 12 feet with no overhang beyond the beam, a double ply beam can span in feet a value equal to its depth in inches. A double 2x12 beam can span 12 feet; a (2) 2x10 can span 10 feet and so on.