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Old 03-30-2017, 09:12 AM   #15
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Originally Posted by Statgeek View Post
This is the first time I've seen this idea... I wonder what the weight limits are on those things? Would they support a 30,000 lb DP too?
According to HomeDepot's website, "these grates are rated for class B load of 61-175 psi, recommended for medium-duty pneumatic tire traffic, autos and light trucks at speeds less than 20 MPH"

My gasser has 9" round pads under the jacks, but only about 7" come in contact with the ground, which is about 38 sq in (Area = pi x radius squared). 38 sq in x 100 psi (average of 61-175 rating) = 3,800# weight limit per pad. However, at over $16/resin cover, these are moderately priced.

I found 12" square recycled rubber pavers at Menards for only $2 each. Although they are only about .8" thick, we've used them twice on gravel pads and they show no signs of wear.
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Old 03-30-2017, 09:16 AM   #16
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Quote:
Originally Posted by Allen_C View Post
According to HomeDepot's website, "these grates are rated for class B load of 61-175 psi, recommended for medium-duty pneumatic tire traffic, autos and light trucks at speeds less than 20 MPH"

My gasser has 9" round pads under the jacks, but only about 7" come in contact with the ground, which is about 38 sq in (Area = pi x radius squared). 38 sq in x 100 psi (average of 61-175 rating) = 38,000# weight limit per pad. However, at over $16/resin cover, these are moderately priced.

I found 12" square recycled rubber pavers at Menards for only $2 each. Although they are only about .8" thick, we've used them twice on gravel pads and they show no signs of wear.
Thanks Allan! I'm going to look into those pads. I consider that price pretty darn reasonable!
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Old 03-30-2017, 09:24 AM   #17
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Jack Blocks

Here is a set of blocks I built out of scrap laying around the shop. The size is based on what will fit nicely in the basement stacked on top of each other. Built from treated 5/4 deck boards on the side and cross brace and 3/4" plywood all glued together. I used 1/4" eyelets to drag them in/out using the awning rod. Works great and real cheep.
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Old 03-30-2017, 09:30 AM   #18
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Thanks Allan! I'm going to look into those pads. I consider that price pretty darn reasonable!
I misplaced an important decimal and corrected the weight capacity to 3,800#! Sorry for the confusion. That said, we do not know what part of the cover they are rating and we can argue that it is the outer lip, which would be logical for how a cover is used and driven over. For our use, the weight is spread over the center part of the cover, which should be far more capable.
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Old 03-30-2017, 09:32 AM   #19
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I have a friend that is a general contractor (home builder). I got some pieces of 2"X12" laminated beam from him (scrap pieces that would have been thrown away). The laminated beam material is several times stronger than regular 2"X12" lumber.

I have used scrap pieces of 2"X12" lumber for years to level trailers & fifth-wheels without leveling systems. I found that regular pine 2"X12" lumber can split when the weight is applied, if on slightly unlevel ground.

The laminated beam material works great and has never split... Plus, the price was right.
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Old 03-30-2017, 09:47 AM   #20
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Quote:
Originally Posted by Allen_C View Post
I misplaced an important decimal and corrected the weight capacity to 3,800#! Sorry for the confusion. That said, we do not know what part of the cover they are rating and we can argue that it is the outer lip, which would be logical for how a cover is used and driven over. For our use, the weight is spread over the center part of the cover, which should be far more capable.

Oh. Yea. That makes a big difference. Thanks again Allan. I agree that I suspect the weight limit is probably based on the lip. But I'll just stick with what I have now..
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Old 03-30-2017, 07:26 PM   #21
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Another vote for laminated 2x12 beams cut to about 12-15 inches long. Much stronger than regular stick lumber. Most large contractors, or home stores have scraps laying around.

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