Engineering help.

9 years ago

I have a room off my house that projects out from the back of the house. So 3 sides, have views of the backyard. The room is 26'.6" wide and 17'.6" out into the back yard. It is a raised house with a crawl space underneath, there is about 3 feet below, 2" x 10" joist are run 12" on center, the width of the room IOW joists are 17.6 long. I ran the deflection meter, I know I need to do some pilings, and support beam, to install tile due to deflection.

My question is, what size beam needs to run the length down the middle of the room underneath. Will another 2"x10" x 26.6 do it. I am just using 26.6 for purpose to show the direction. I know it will be less and will have to be lap jointed in the middle. I'm thinking 2 2x10's laminated together.

Also this is the purposed space for a new kitchen, and we want to beef up the room for the use of a granite counters. With a large island somewhere in the center.

Thoughts. TIA

Featured Answer

User

9 years ago

You need a structural engineer, not strangers on the internet.

Sort by:Oldest

Comments (8)

klem1
9 years ago
How new beam is supported is as important as what it's made from. You will need 2 new piers. How deep piers must go depend's on your soil.
Related Professionals
Fort Myers Home Remodeling · Miami Home Remodeling · Williamsburg Home Remodeling · Mesquite Home Remodeling · Orlando Home Builders · Branson Home Builders · Mason City Home Builders · Mankato Home Builders · Elizabethtown Kitchen & Bathroom Designers · Alpena Kitchen & Bathroom Designers · Keene Kitchen & Bathroom Designers · Bridgeport Kitchen & Bathroom Designers · Mission Viejo Kitchen & Bathroom Designers · Idaho Falls Kitchen & Bathroom Designers · Coos Bay Kitchen & Bathroom Designers
jjaazzy
Original Author
9 years ago
Thanks Klem1 yes, 2 piers I did further research and found to dig down 12" and make a form and pour concrete pier bringing the pour, up 4" above soil line. For a total of 16". That part I am clear on. It's the beam I would like more detail.

And Lazy...I completely agree, after calling one after the other, after another, no one called me back. And the one man who did speak to me, gave me this info but, is now retired. He was very kind and spoke to me on the how too over phone. However we didn't get the beam size, he referred me to someone who you guessed it, didn't call me back. So that's where we are at. And Lazy don't underestimate these strangers on this form, they are amazing.
klem1
9 years ago
When you make the beam,sandwiching 3/4tr plywood between 2xs double's strength with little added weight. Plywood also help's with overlap joints. If for some reason you can't use plywood,20 ga sheet metal has unbelievable strength when captured between framing.
jjaazzy
Original Author
9 years ago
Thanks klem1 ...so 2x10's lap joined (2ft in each direction for a total of 4 ft.) in the middle with 20 gauge sheet metal or 3/4" ply sandwiched in the middle the entire length. We have a large nail gun (10p?) should it be nailed together the length of the beam and also bolted too? We did a 2nd story deck and laminated the existing beam no lap joint to beef it up. I believe both fasteners were suggested, nails and bolts.

I can't thank you enough.
jjaazzy
Original Author
9 years ago
I have to look at nail gun again, don't remember specks, but I think we are good with it.
klem1
9 years ago
Glue is preferred over bolts. Call glue manufactur for approved types glue for your application.
jjaazzy
Original Author
9 years ago
Yes, If we go the plywood route, I forgot to mention glue. Thanks again...