0742786400093

Model # 10550005

Internet # 100350712

Store SKU # 734283

11-1/2 in. x 8 in. x 11-1/2 in. Concrete Block

$4.97 /each

Frequently Bought Together

Product Overview

11-1/2 in. x 8 in. x 11-1/2 in. Concrete Block meets ASTM C 90 guidelines. For use in foundations or above-grade masonry walls. These 50 lb. blocks may be used for mounting of deck support posts. They are dimensionally true and uniform in texture.

  • Square concrete block with no large chips or breaks
  • Use in foundations or above-grade masonry walls
  • Uniform in shape, color and texture
  • Meets ASTM C 90 specifications
  • Used for mounting or supporting post
  • Note: product may vary by store

Specifications

Dimensions

Product Depth (in.) 
11.5 
Product Height (in.) 
Product Width (in.) 
11.5 

Details

Color Family 
Gray 
Compression strength (psi) 
1900 
Product Weight (lb.) 
50 lb 
Water repellent 
No 

Warranty / Certifications

Manufacturer Warranty 
N/A 

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Customer Questions & Answers

24 Questions47 Answers

Customer Questions & Answers

11-1/2 in. x 8 in. x 11-1/2 in. Concrete Block
11-1/2 in. x 8 in. x 11-1/2 in. Concrete Block

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3 answers

Could you use these to make a fence?

This question is from 11-1/2 in. x 8 in. x 11-1/2 in. Concrete Block
Asked by
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March 3, 2016
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Answers (3)

Asked by
Upstate NY
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Home Improvement Profile: DIYer
April 25, 2016
Answer: 
As these just set on top of the ground, and a fence has a larger surface area to catch wind, I would not recommend using these to support a fence.
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March 4, 2016
Answer: 
Thanks for your question. Yes, you could use these as the foundation for a fence post.
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March 3, 2016
Answer: 
The product is suitable as a base for fence posts.
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3 answers

How do you keep the concrete from rotting the wood?

This question is from 11-1/2 in. x 8 in. x 11-1/2 in. Concrete Block
Asked by
Agawam Ma
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September 7, 2015
How do you keep the concrete from rotting the wood? Concrete wicks water and wood absorbs it.
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Answers (3)

Asked by
Upstate NY
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April 25, 2016
Answer: 
I bought a small gallon can of roof tar and painted the bottom area that sets inside this block to waterproof it.
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September 10, 2015
Answer: 
You should either use a membrane barrier or pressure treated wood to prevent rotting.
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September 9, 2015
Answer: 
Thank you for your inquiry. To prevent having this issue, you can use a membrane barrier or you can use pressure treated wood.
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3 answers

can these be used to support a deck?

This question is from 11-1/2 in. x 8 in. x 11-1/2 in. Concrete Block
Asked by
Arundel, Maine
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August 8, 2015
I have a yard that is very rooty, roots everywhere! Very hard to dig and not get over run by roots. I am looking to build a 8' X 16' deck for my mothers mobile home.
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Asked by
Upstate NY
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April 25, 2016
Answer: 
Thats why I bought mine, my deck was also 8' x 16 foot long. These are designed with decks in mind I believe thats the main purpose of these. Works great.
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August 10, 2015
Answer: 
Thank you for your inquiry. Yes, these blocks can be used to support the deck. Please just make sure the block has a firm foundation before building and adding weight.
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August 9, 2015
Answer: 
Yes, this product can be used to support a deck.
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3 answers

Can I use these to support a 5x5x5 platform?

This question is from 11-1/2 in. x 8 in. x 11-1/2 in. Concrete Block
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August 1, 2015
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Asked by
Upstate NY
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August 4, 2015
Answer: 
Yes easily.
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August 3, 2015
Answer: 
This item can be used to support your platform. Best of luck with your project!
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August 2, 2015
Answer: 
Yes, this product will support a 5 by 5 by 5 platform.
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  • 2016-07-25 T19:45:44.565-05:00
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Customer Reviews

Rated 3.3 out of 5 by 9 reviewers.
Rated 5.0 out of 5.0 by for those who cant fit a 4x4 post inside big box stores sell actual 4x4 posts and then they sell the 4x4 like other dimension lumber. I brought my tape measure with me to make sure the 4x4's I bought were actually 3.5 x 3.5 which fit perfectly in these blocks. I think the manufacturer meant the later, or the dimensional 4x4 fits. I built a deck 6x14 and these saved a tone of work and my local code officer approved them in advance as I had asked before making a purchase. July 3, 2015
Rated 2.0 out of 5.0 by Yup, they are right, too small Wish I read reviews before purchasing. They look like they will fit a 4x4, but are 1/4 inch too small. I ended up using a 2x4 and trimming it down to fit in only for stability and no ground contact on a generator deck. Do not use for a real deck! May 17, 2015
Rated 1.0 out of 5.0 by Too small Bought 12 of them for a deck- too small. Not sure yet if I'll taper the ends or return it. July 9, 2015
Rated 1.0 out of 5.0 by Horrible qualty control These are designed to fit a 4x4 post. They don't. I already had them out in a remote area to build a temporary stand up off of the ground for winter. I had 6 of these. And all 6 of them didn't fit a 4x4 post. I had to trim down each post about 1/4" (final measurement was 3.25x3.25") so they would fit. If it wouldn't have taken me less time to trim the posts than to return these to HD, I wouldn't have bothered. December 1, 2014
Rated 5.0 out of 5.0 by Used to "anchor" bird feeder I have in ground bird feeders that are quite heavy. We have raccoon baffles on the feeders so the squirrels and raccoons can't get to the seed. I have one of these at the base over the support L-arm and I surround it with concrete blocks so I have something to stand on the reach the feeders. Works so good I am getting another block for another feeder! Of course it wasn't an easy task to install this but it's worth it. April 27, 2014
Rated 1.0 out of 5.0 by DO NOT BUY!!!! I bought 37 of these to finish a pool deck. The blocks I started with were out of stock at another store. This block is specified to receive a 4x4 support post. The first post I tried to install split the block in two. Subsequently EVERY block thereafter had to be chiseled out to receive the 4x4 post. This added days and a great deal of misery to the project.I would NOT recommend this product to anyone unless of course you are trying to hone you chiseling skills. July 14, 2013
Rated 5.0 out of 5.0 by Needed additional support footings for a 23 foot tall tree house. They worked great Needed additional support footings for a 23 foot tall tree house. They worked great. It's been 2 years now and they are still set in place, no cracks. Also used them last year building a shed December 3, 2013
Rated 5.0 out of 5.0 by Nothing fancy I used a couple of them to hold fence posts for a 3 foot "privacy fence" and no issues yet. May 21, 2013
  • 2016-07-24 T18:26:24.308-05:00
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