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Drilling a patio slab?
- Thread starter Wyn
- Start date
PHIL HYETT
Well-Known Forum User
Drill
900ss If you use a progression of sizes to get the final size that might help , slow and easy will do it .
Regards
Phil
900ss If you use a progression of sizes to get the final size that might help , slow and easy will do it .
Regards
Phil
Wyn
Club Member
Sounds simple then, cheers 
Bolt-Down Post Support 50 x 50mm Pack of 2 | Screwfix.com
Those are the post supports i'm using to support metal posts.
Whats the name of the bolts to bolt them down and through a slab ?
Or should it be a stud n nut I use?
Bolt-Down Post Support 50 x 50mm Pack of 2 | Screwfix.com
Those are the post supports i'm using to support metal posts.
Whats the name of the bolts to bolt them down and through a slab ?
Or should it be a stud n nut I use?
Wyn, bolting a carport to a slab is a bit temporary. You really need to lift the slabs where the legs go and provide concrete foundations. Even a slab size cube of concrete is better than a slab.
STEVE BURNS
Club Member
personally I would use a post spike because if you got a serious gale blowing it could lift the slab
Take the slab up drive in the spike and then screed in the space where the slab was removed
Take the slab up drive in the spike and then screed in the space where the slab was removed
STEVE BURNS
Club Member
almost snap Mr Gaskin but you type faster than me
STEVE BURNS
Club Member
how do you know there is concrete underneath normally slabs laid on a hardcore base blinded with sand
Wyn
Club Member
I had the patio relaid 2 weeks ago as I trashed the last one with me Z resto work lol
This time before it was relaid the base was dug out more as I wanted to stand the car back on it
I say concrete but it still looks sandyish colour to me n not grey like concrete, even though I saw the cement bags as it was mixed?
STEVE BURNS
Club Member
What would worry me is that it is almost the same principle as using a long crowbar to move something
The longer the pole the easier it is for any movement at the top of the pole to disturb or lift the slab the pole is fixed to
I would imagine that the sandyish coloured stuff is a mix of sand ,lime and a small amount of cement used to lay the slabs on
The longer the pole the easier it is for any movement at the top of the pole to disturb or lift the slab the pole is fixed to
I would imagine that the sandyish coloured stuff is a mix of sand ,lime and a small amount of cement used to lay the slabs on
PHIL HYETT
Well-Known Forum User
Car port
Hi , Had a think , Best way to do it is raise the slabs that the post are going to be , dig down three feet fill with concrete , then bolt posts to that using studs or bolts , Bolting thru slabs as said by others is not good enough .
Regards
Phil
Hi , Had a think , Best way to do it is raise the slabs that the post are going to be , dig down three feet fill with concrete , then bolt posts to that using studs or bolts , Bolting thru slabs as said by others is not good enough .
Regards
Phil
Wyn
Club Member
Ok, on a diffo note where is the better position to fix the post
Post will need to be as far out as poss !
So Foot1 or Foot 2?
See attached techie pic
Straddle between the two slabs, or the middle of one slab?
Attachments
johnymd
Club Member
If you go that close to the edges you will probable crack the slab. Foot 2 would be better.
You mentioned the sandy concrete. How deep was it? Did it have stones in it? If it didn't have stones it was probably a weak sharp sand/cement mix. This is a usual way of laying slabs that you don't want to move. If it was mine then I would drill holes down into the concrete base then use 10mm studding. I'd fix the studding with chemical fix resin. If you use rawbolts or any expanding fixings it will probably crack the base and the slab as you tighten them.
Unless you hold the car port down properly you may find it in next doors garden after the first strong wind so you need to fix it to the base rather than just the slabs.
You mentioned the sandy concrete. How deep was it? Did it have stones in it? If it didn't have stones it was probably a weak sharp sand/cement mix. This is a usual way of laying slabs that you don't want to move. If it was mine then I would drill holes down into the concrete base then use 10mm studding. I'd fix the studding with chemical fix resin. If you use rawbolts or any expanding fixings it will probably crack the base and the slab as you tighten them.
Unless you hold the car port down properly you may find it in next doors garden after the first strong wind so you need to fix it to the base rather than just the slabs.
Wyn
Club Member
At a guess i'd say 10" maybe a bit more ?
Didn't have stones mind.
This is how far it is as of now ..
Started this morning with half the frame in place. The whole thing has been erected with nothing permanent in mind
By that I hope I don't mean it will fall over lol
Still work to do but the main frame is up now
Changed the size of the feet as now using 4x4 posts, so their size and weight must help?