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Mikedks 09-13-2006 03:24 PM

Temporary support for replacement of basement beam
Hi all,
I just ran across this forum while looking for info, so here I go...Am starting a DIY basement renovation on my ugly 60's split-level ranch w/walk-out basement. I have already gutted the space completely and have had an architect draw plans and have consulted with a structural engineer. The house is 36' feet wide with a support beam running the length of the space, supported by three lally columns. There are actually three seperate beams, the first is double 2x10 w/a flitch plate, about 15 feet long, goes from top of foundation(cinder block) to 1st column. Second section is double 2x10 only, about 6' long and goes from column 1 to column 2(also has a huge hole cut thru this section for duct work!), third section is also about 15' feet long, double 2x10 only, goes from column 2 to top of other side of basement, with column 3 supporting the center of this section. I will be replacing the damaged 6' section first and then, using engineer's plan, am removing column 3 and installing a 5/8 in.thick x 9 in. wide x 15' foot long flitch plate between doubled 2x10 in that 15' foot section. House is level and solid, no problems to begin with.
First question is this, what is the safest way to temporarily support the joists when I remove the column and beam?, small hydraulic jacks w/4x4 supports?, not sure which way to go, mainly which is the safest.
Second question is slightly off topic, whats a good waterproof sealant for cinderblock walls in a walkout basement?, space is actually dry, just looking to seal before building out.
Thanks in advance.

redline 09-13-2006 06:35 PM


Originally Posted by Mikedks (Post 18031)
First question is this, what is the safest way to temporarily support the joists when I remove the column and beam?, small hydraulic jacks w/4x4 supports?, not sure which way to go, mainly which is the safest.

Thanks in advance.

What is above this beam? Any heavy items? Any load bearing walls?
How thick is the basement floor?
How thick are the floor joists? What is the center to center distance on the floor joists?

AtlanticWBConst. 09-13-2006 07:18 PM

I would suggest that you use 6x6 posts for temp support.

Good Cinder block sealant: Try Drylock, get it in a 5 gallon container and save yourself some money.

Mikedks 09-13-2006 07:19 PM

Floor joists are 2x8's, 16 on center.
No heavy loads above, two bedrooms, only one is occupied.
According to structural engineer, we have a truss roof and all
walls on first floor are essentially partitions, so no load bearing walls
above. The basement is actually a slab, about 40yrs old, in near perfect condition. We unfortunately do not know the thickness of the slab.

fhivinylwindows 09-13-2006 07:29 PM

I use to replace sills that had ant damage. We would use 4x6 or 6x6 and use timber screws to attach them to the joist. Once these are in place we would have another set on the floor and then use the adjustable lally columns to raise the joist enough.
1. By screwing the beam to your joist you will reduce the columns slipping.

2. By placing beams on the floor you will spread the load on the concrete. I have never cracked a floor yet.

3. The adjustable columns are around $20 each at HD

I use to use UGL for basement paint, make sure you ventilate the area, it will make you sick and very dizzy.

Mikedks 09-13-2006 07:45 PM

Ok, so I should probably be using 6x6's, but how many supports would I need for a 15 foot beam?. I was thinking four seperate supports, 2 on each side.

Mikedks 09-13-2006 08:32 PM

1 Attachment(s)
check out the photo's of the basement.

This is the 6 foot center section with cut-out for old ductwork, Nice!

AtlanticWBConst. 09-14-2006 06:28 PM


Did termites do that?

Mikedks 09-14-2006 07:36 PM

HVAC morons!, you should have seen the stuff the inspector missed on this house!. Gonna fix that one this weekend.

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