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Re: Fire Damaged Slab on Grade[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Fire Damaged Slab on Grade
- From: "Dennis S. Wish, PE" <dennis.wish(--nospam--at)verizon.net>
- Date: Mon, 07 Mar 2005 22:13:59 -0800
Jonathan Smith wrote:
It may be different in South Carolina but here in Southern California a garage slab is rarely constructed with turn down edges. Instead it is considered flatwork and is placed separately from the foundation bearing walls. This allows the slab to also be sloped for drainage to the front of the garage. We would call it flatwork here.List: What recommendations do you have for collecting information for a condition survey of a residential single family dwelling garage slab-on-grade (presumably a turned down slab at perimeter) that has been subjected to a fire? I plan to visit the site this weekend. I realize that the extent of potential damage is a function of the fire duration and burn temperature and possibly the type of aggregate. Expensive petrographic analysis does not appear warranted as a new wood framed gable roof and light framed walls will be the only structural loads applied at the perimeter other than vehicle loads within the garage area. The Client appears reluctant to pay for coring as well. Schmidt hammer testing should provide some relative idea of compressive strength. What are your thoughts? Jonathan D. Smith, P.E., Owner Summit Engineering & Inspection 236 Lorraine Drive Travelers Rest, SC 29690 Phone: (864) 834-3385 Fax: (864) 834-3261
Inasmuch as heat rises, I have rarely found that much damage to a slab on grade, however, unless you are dealing with unusual soil condition like expansive soils then I would probably take a couple of cores and do a shear and compression test to verify the minimum strength. I assume you are not dealing with a post-tensioned slab on grade.
Take a look at the edges of the slab to verify if it monolithic or dual-pour with the slab itself acting only as flatwork. If damaged, it can be removed and replaced. If you have any expansive soil conditions, I would probably thicken the edge of the slab and dowel it into the perimeter foundation.
Dennis S. Wish, PE
California Professional Engineer
Structural Engineering Consultant
760.564.0884 (office - fax)
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- Fire Damaged Slab on Grade
- From: Jonathan Smith
- Fire Damaged Slab on Grade
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