You are here:

Building Homes or Extensions/Joice span and size verses weight load

Advertisement

Expert: - 9/19/2007


Question
I want to prep my garage for a future loft, what size of floor joice do i need to span 30ft without supports.

Answer
You are not going to make it with any dimension lumber product.  You will need to look at TJI joists, steel bar joists, LVLs, or flat trusses.  Flat trusses might work quite well as the web spacing provide good room for routing HVAC, water, sewer, and electric.  I am guessing that you will be in the 16 - 24" dimension with most materials to carry 40 PSF if this a loft for humans *bedroom, etc).  If it is for heavy storage, you will need 100PSF.

Building Homes or Extensions

All Answers

Answers by Expert:

Ask Experts

Volunteer

Dan Griffin

Expertise

I can answer almost all questions related to the total construction process. My expertise is in commercial construction, though I can field most any residential question. I have hands on experience in concrete, heavy equipment, masonry, all phases of carpentry, interior finishes, and I am fairly strong in mechanical and electrical.

Experience

I have over 20 years experience as a commercial carpenter and commercial construction superintendent. I have another 20 years experience in facility management for a major school district.

Organizations
My favorite hobby for he past 12 years has been singing bass in a The OkChorale men's barbershop chorus and the Mature Moments quartet.

Education/Credentials
I hold a Bachelor's degree in English and Math. I have completed many continuing education hours in the building trades. I hold a Master Carpenter card from the AGC, Associated General Contractors.

©2012 About.com, a part of The New York Times Company. All rights reserved.