Posted 18 October 2015 - 04:34 PM
Always fancied one. Got a double garage so seems rude not to. Getting fed up jacking up the cars and messing around with axle stands every time when doing oil, exhausts, hand brake cables etc.
Plenty of mates who'll help dig for payment in beer too!
A few thoughts:
- Some argument for a cruciform shaped pit for easy access to sills
- Can't decide on block walls or poured concrete. Was mulling over digging a BIG hole first obviously. Then make a BIG, braced wooden box "former" and lower into hole. Drop in mesh into hole and pour concrete around it and poker/vibrate in.
- Could cast in steel conduit and back boxes for the electrics if pouring mass concrete by attaching everything to the wooden box.
-Ventilation, sump pump, angle iron "rim" for a jacking beam etc
Posted 18 October 2015 - 04:56 PM
Finally, make sure you dig the hole safely. A pit sized hole would be lethal if it collapsed on you whilst digging, so shore it up as you go. Anything much over about a metre deep is likely to kill you if it collapses.
Posted 18 October 2015 - 05:13 PM
foundations finished.jpg 56.81K 6 downloads
It's only small at 1.2 metres by .9 metres and about 1 metre deep (rough measurements, I can't remember exactly)
I had the same in my present house and it has worked well.
The size is designed for you to sit in, on a duck board (on old pallet) and when so seated my nose is level with the floor.
I only use it for things like an oil change, but sitting in that to unscrew an oil filter or remove the sump plug is infinitely better than crawling on your back under a jacked up car.
The bottom is a concrete slab and the walls are concrete blocks. the garage floor being cast onto the top of the blocks.
Edited by ProDave, 18 October 2015 - 05:14 PM.
Posted 18 October 2015 - 05:26 PM
For most jobs though I don't need to move the car. Park it so there's just room to get down into the pit, and that places my sump just the other side of the pit above the floor, but within easy reach, so the oil tray is on the floor to catch the contents.
It works for me but for serious mechanical work you would probably want something bigger.
Edited by ProDave, 18 October 2015 - 05:26 PM.
Posted 18 October 2015 - 05:31 PM
Posted 18 October 2015 - 07:06 PM
Posted 18 October 2015 - 09:23 PM
The consensus out there seems to be to incorporate an EPDM "pond liner" in the build to act as a DPM. Seen it done sandwiched between an inner and outer wall. I'm the lowest house in the valley. The single track lane at the bottom of the drive used to be an old water course before it was tarmac'd over. Come to think of it during heavy rain it's still about a foot deep! Waterproofing here is a must.
First on the materials list seems to be a beer fridge for the labourers!
Posted 19 October 2015 - 11:55 AM
From about £1500-2000.
The problem is that the boss will perceive it as an add-on luxury.
Posted 19 October 2015 - 12:00 PM
Agreed you can get them cheap, I installed a 4 poster for a friend in an industrial unit and I believe he got that for under £2K. Mind it's certifications said the steel lifting wires need replacing next year, so I guess that's a big expense, unless you just ignore it.
Posted 19 October 2015 - 05:02 PM
Posted 25 October 2015 - 09:31 PM
The suggestion was made that the structure must weigh more than 1000 kg per cubic metre.
I'm being really pedantic but its important to realise that the 1000kg/m2 relates to the total displaced volume of the structure.
I.e. a pit measuring 2m x 1m x 1.5m deep displaces 3 cubic meters, therefore the weight of all the concrete/steel/timber etc would need to be 3000kg to ensure it wouldn't float if surrounded by water.
Just a thought.