Concrete Blocks Crumbled on 8 x 17 porch: New Deck Over Top?

rru2sAugust 29, 2006

My 8 x 17 concrete back porch (2 ft. to 4 feet high) has about 4" concrete slab supported by concrete blocks. Gradually over the last 20 years several of the blocks under the top slab have crumbled all the way through.

I want to cost effectively fix the problem or rebuild. The slab has not collapsed yet but has a few hairline cracks. About 4 linear feet of concrete block has crumbled to nothing, just the top level of block by the steps, and in another area 2 linear feet of block, top level, by the taller steps, plus lots of hairline cracks tracing along the block seams on the side walls. The porch was built about the time of the addition, according to previous owner this would be around 29 years ago.

Here is the big question -- I want to permanently fix the problem, but don't want the expense of a complete new porch of this large size.

(1) Can this level of concrete damage be repaired? Temporarily or permanently? Relative cost versus doing a deck over it?

(2) Can I just build a deck over the top and ignore the deterioration of concrete without problems later when it falls apart? Note that the concrete slab is only about 6 inches below the slider of my family room, possibly not enough height room to install a joist for a deck anchored to the house. I don't think I should use the porch itself to support the deck over it because the main problem is the porch itself could collapse at some point in the next 3 to 5 years.

(3) Can I just demolish the concrete slab over the top of the porch and knock down the top layer of side concrete blocks, letting all the debris rest in the center of the hole. Then I can build a deck over and around the old sidewalls, using standard wood deck construction, and anchor the deck to the house?

(4) None of the above - any other suggestions?

There is not a water problem at the moment, but I have a cape cod house. It is possible the steep roof in conjunction with my gutter guards have allowed more water to roll over the top of the gutters and onto the porch over the years (solve one problem, create another). It is also possible that using salt on icy days in the winter on the porch also caused problems over the years.

Thank you for reporting this comment. Undo

I kinda like #3. John

    Bookmark   August 29, 2006 at 6:13PM
Thank you for reporting this comment. Undo

I've just discovered this site and am curious how your solved your problem. I have a concrete porch consisting
of just 3 steps with the top being about 4 ft. square or
a little smaller. I'd like to make the steps larger and
add a little decorative style. Wondering if I can add
to the size without starting all over. (which I definitly
won't do. - too much work)
Our house has half-log cedar siding and a smallish cedar
deck would look nice there too so wondered if you did that.
Thanks a bunch.

    Bookmark   April 15, 2007 at 12:24AM
Sign Up to comment
More Discussions
Exposed wiring in patio cover
We are building a new backyard patio cover and the...
removing deck stain from vinyl siding
Greeting GW: I just re-stained my deck with BEHR PREMIUM...
My aging parents need new front and back steps leading...
Bad Caulk Job- Need Advise
We had some structural work done to our front patio....
Vanessa Abbey
Staining fence
Hi, We had a picket fence installed last summer. Per...
Sponsored Products
Pagoda crimson napkins (set of 4)
Origin Crafts
Stack, Pull, & Tumble Blocks Game
$15.99 | Dot & Bo
David Bromstad "Pink Block" Artwork
Grandin Road
Schonbek Quantum Block 36 1/2" Silver Crystal Chandelier
Lamps Plus
Modern Design House Stockholm Block Lamp Table Light
Push-button Tilt 9-foot Aluminum Patio Umbrella
Premium Cirrus Ice Ball Press - 2-3/4" dia.
$799.00 | FRONTGATE
63" Double Trough Trendy Gray Granite Bathroom Sink - FOLEGE
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™