Digging post holes with a pressure washer
Digging post holes with a pressure washer
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Discussion

Spare tyre

Original Poster:

12,528 posts

159 months

Monday 31st August
quotequote all
Has anyone done this, I’ve seen videos where it appears easy but what’s the reality. I would give it a go but I don’t own a pressure washer

I need to build a lean too sort of affair to house kids bikes, a trailer etc to keep them out of the elements

However the area it needs to go is full of gas / water / electric / broadband cables - I’m nervous of striking one and getting in more trouble with the boss than usual

So my plan is to dig test holes with water and then postcrete them in if suitable

Cheers

Huzzah

28,933 posts

212 months

Monday 31st August
quotequote all
Spare tyre said:
Has anyone done this, I ve seen videos where it appears easy but what s the reality. I would give it a go but I don t own a pressure washer

I need to build a lean too sort of affair to house kids bikes, a trailer etc to keep them out of the elements

However the area it needs to go is full of gas / water / electric / broadband cables - I m nervous of striking one and getting in more trouble with the boss than usual

So my plan is to dig test holes with water and then postcrete them in if suitable

Cheers
Sounds messy.

JoshSm

4,891 posts

66 months

Monday 31st August
quotequote all
The idea is relatively sound (if sensitive to the type of ground and things like stones needing clearing) but the mess it creates is going to be biblical.

Excavation with water works but everything from the hole is going to end up all over you and everything else.

And if the area isn't free draining it's going to be worse!

Also if there's much in the way of roots it won't work well.

MDT

845 posts

201 months

Monday 31st August
quotequote all
The success rate will be very dependent on the type of soil you have... but as others have said the mess you are making is going to be significant.

If you really are worried about hitting cables and pipes. how about digging it slowly by hand. I mean yes it will take time and be tedious, but not as tedious as the ear bashing you will get from the boss when you hit a gas pipe and she can't get a bath that night.

biggiles

2,153 posts

254 months

Monday 31st August
quotequote all
Digging with water works in Youtube videos where the soil is made of perfect loamy soil, without any stones. I think it's a bit harder in the average UK garden.

If you're doing a lean-to for bikes, and don't want to dig, why not just lay a concrete base and mount the posts on that using galvanised post mounts?

21TonyK

13,257 posts

238 months

Monday 31st August
quotequote all
Post hole digger and a trowel. Quick and clean.

Pressure washer? Put it on YouTube and post a link.

DSMSMR

1,125 posts

18 months

Monday 31st August
quotequote all
iron bar, spade or trowel.....lots of sweat.

ATG

23,654 posts

301 months

Monday 31st August
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The squirty bit is only half of a proper water jet excavator. To make the system really work you need the mother of all vacuum cleaners to suck out the slurry as quickly as you're blasting fresh water into the hole. Put the two together and you're in business. Only use the jet wash lance and you're in a big puddle of muddy water on top of a hole of indeterminate size and depth.

Still worth a try though. Please post pictures.

ATG

23,654 posts

301 months

Monday 31st August
quotequote all
DSMSMR said:
iron bar, spade or trowel.....lots of sweat.
If you're nowhere near any gas, water, oil or sewage pipes, nor buried cables, then 100% the above and post hole diggers also have their place if digging small cross-section holes.

If you know that previous installers have put tape in the backfill above services, then all of the above, 100%, and proceed carefully.

If you have no confidence that previous installers will have done anything other than lay boobytraps for you and your wife is going to kill you if anything goes wrong, then, dear OP, you are buggered.

Simpo Two

92,641 posts

294 months

Monday 31st August
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And don't forget the water shortage...

Seems a bit like cutting wood with an angle grinder, or doing screws up with a chisel.

Magooagain

13,331 posts

199 months

Monday 31st August
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Ridiculous! Just use a spade and be careful, it’s not a race.

Spare tyre

Original Poster:

12,528 posts

159 months

Monday 31st August
quotequote all
Bottoms, I hoped it was some life hack that worked really well

stinkyspanner

971 posts

106 months

Monday 31st August
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My soil is a mixture of clay, tree roots and flint and is really hard to dig. I bought a spud bar, and borrowed a post hole digger of my mate and dug 10 holes which was massively hard graft. It was however, very satisfying and therapeutic as with every thrust of the spud bar I imagined that the builder who ripped me off was in the bottom of the hole.
Not really relevant to the pressure washer thing, but if you've got a frustration or anger to get rid of I recommend doing it by hand

paul.deitch

2,314 posts

286 months

Monday 31st August
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Our borehole was done with a high pressure lance and a pump with a coarse filter was used to pick up the backwater and throw it into a drum. The feed for the lance was in the drum. It wasn't that messy. They went down 8 meters and I have garden water all year.

OutInTheShed

14,332 posts

55 months

Monday 31st August
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paul.deitch said:
Our borehole was done with a high pressure lance and a pump with a coarse filter was used to pick up the backwater and throw it into a drum. The feed for the lance was in the drum. It wasn't that messy. They went down 8 meters and I have garden water all year.
Interesting!

Thanks for sharing that.

DSMSMR

1,125 posts

18 months

Monday 31st August
quotequote all
Magooagain said:
Ridiculous! Just use a spade and be careful, it s not a race.
spade, in Cornwall.....6 inches of topsoil then slate and granite...LOL.

CoolHands

23,341 posts

224 months

Monday 31st August
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Whereas a wicks pressure washer would go through bedrock no problem? drunk

OutInTheShed

14,332 posts

55 months

Monday 31st August
quotequote all
DSMSMR said:
Magooagain said:
Ridiculous! Just use a spade and be careful, it s not a race.
spade, in Cornwall.....6 inches of topsoil then slate and granite...LOL.
Go much deeper and you're at risk of finding some other bugger has hollowed it out >150 years ago, by manual graft.

hidetheelephants

35,687 posts

222 months

Tuesday 1st September
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21TonyK said:
Post hole digger and a trowel. Quick and clean.

Pressure washer? Put it on YouTube and post a link.
hehe Do it wearing something wildly inappropriate like a tuxedo, add a stty clickbait title and it could get decent numbers; knock up an AI thumbnail with a woman in a bikini and it will coin it in.

rodericb

8,839 posts

155 months

Tuesday 1st September
quotequote all
Yeah as some replies have said you're doing hydrovac but you're missing the vac piece of the puzzle which removes the watery mud from the excavation. You can use a wet/dry shop vac or a "sludge pump" attachment on your pressure cleaner lance to get the mess out of the hole.