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jacking up a deck

 
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jema
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Joined: 28 Oct 2004
Posts: 26551
Location: escaped from Swindon
PostPosted: Sun Apr 30, 17 4:12 pm    Post subject: jacking up a deck  Reply with quote    

Just grumbling really, the more interesting garden projects are on hold whilst I sort out the rot that has got into the main deck.

A major section of it which I had thought was being supported by a post in sound condition, wasn't as what I thought was a post wasn't even in the ground

Bits are now supported on dense blocks and two car jacks have almost got the sound wood level. It has to be millimeters more needed, but I have just bottled out and ordered another scissor jack

I guess someone who does this sort of lark for a living has more of a clue just how far you can push things with jacks.

Hairyloon



Joined: 20 Nov 2008
Posts: 14799
Location: Today I are mostly being in Yorkshire.
PostPosted: Sun Apr 30, 17 4:57 pm    Post subject: Reply with quote    

You can push as far as you like, if you have the right sort of jacks.

onemanband



Joined: 26 Dec 2010
Posts: 1473
Location: NCA90
PostPosted: Sun Apr 30, 17 8:54 pm    Post subject: Reply with quote    

My experience is that whether it's a scissor jack, bottle jack ,trolley jack or acrow prop, if you are exceeding it's capacity it becomes hard to operate. If you are struggling to turn it / pump it, it is probably overloaded (or needs a drop of oil)
I'm sure it'll be fine - standard boot-well scissor jack would be rated to 1.5-2ton. A ton of decking is a lot of decking.

jema
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 26551
Location: escaped from Swindon
PostPosted: Mon May 01, 17 12:11 am    Post subject: Reply with quote    

onemanband wrote:
My experience is that whether it's a scissor jack, bottle jack ,trolley jack or acrow prop, if you are exceeding it's capacity it becomes hard to operate. If you are struggling to turn it / pump it, it is probably overloaded (or needs a drop of oil)
I'm sure it'll be fine - standard boot-well scissor jack would be rated to 1.5-2ton. A ton of decking is a lot of decking.


thanks for that, I think it makes the point, I am struggling, but then its not just decking being supported, its a summerhouse with heavy stuff in it.

dpack



Joined: 02 Jul 2005
Posts: 32879
Location: yes
PostPosted: Mon May 01, 17 12:19 pm    Post subject: Reply with quote    

umm ,

be very cautious and careful , scissor jacks have a habit of sudden failure at a bit over twice design load, as mentioned bottle jacks and acrows tend to refuse to exceed safe load to danger levels.

imho hire some acrows and some short scaff boards, jack the thing to a little above the intended position, make repairs and lower it back into place.

be careful and use more acrows than seems necessary to ensure no sideways slip or jack failure leads to a collapse.

side slips are more likely than a jack collapse, especially if the bottom end has any "give" in it so plywood pads and scaff boards at the base is a good idea.

jema
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 26551
Location: escaped from Swindon
PostPosted: Mon May 01, 17 1:51 pm    Post subject: Reply with quote    

Well using three jacks we raised a beam over an inch and a new post is in

jacks will be staying until a couple more posts are solidly in place.

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