Ceiling truss

8/29/2018 at 8:02:05 PM

I would recommend that you consult an engineer for that answer. As it is a rather large span for a 2x10.

8/29/2018 at 8:36:43 PM

I agree with Colin. 20 feet is too long to span with a 2x10 especially on a flat roof with a snow load. Consult an engineer they will be happy to help.

8/29/2018 at 10:18:07 PM

As everyone has said, get an engineer to have a look at the drawings. But I would use a minimum 2" 14" LVL Beams at 16" on centers.

Confirm this first.

8/29/2018 at 10:20:11 PM

I'm interested to know if Rancho Cucamonga is in Canada or in Cali? If the project location is in Cali probably wont need to consider snow loads.

According to the span tables in the current (2014) Alberta Building Code the maximum span for 2 x 10 roof joists with the lowest snow load given in the tables (1.0 kPa) is 6.22 m if using No. 2 Douglas Fir or 5.93 m if using No. 2 SPF (both examples are 16" o/c, even if 12" spacing is used it still doesn't work).

When you make your permit application the plans examiner should be looking for either:

a) compliance with span tables in your regional Building Code,

b) a computer design from a supplier of engineered lumber (I-joists) or trusses (usually done by a certified technologist), or

c) details of the structure stamped by a registered architect or engineer.

8/30/2018 at 8:10:55 AM

I would go probably 12 inch centers unless you have a supporting wall or beam halfway across the span.

8/30/2018 at 8:29:53 AM

Rancho Cucamonga is an affluent city situated at the foothills of the San Gabriel Mountains in San Bernardino County, California. It is located 37 miles east of Downtown Los Angeles.

8/30/2018 at 10:18:03 PM

Definitely 16-inch centers. I would check with your local municipality on code. I believe 20 feet or more you need 2" 12" 16" Centers. Hope this helps you out.