Waterproofing Concrete

[Millwright]

Can I use a waterproof PVA for water proofing a concrete mix?

I'm setting fence posts into the ground and had the idea of making sure the concrete can't get soaking wet inside. Can waterproof building PVA be used liked this or is there something else for the job?

Thanks.

 

[limerockconstruction]

You don't need to waterproof the concrete, even if you did you wouldn't use PVA.

Why not use Postcrete instead - manufactured for the task at hand and goes off very quickly...

 

[^woody^]

Why on earth would you want to waterproof concrete to a fence post?

 

[Millwright]

Why on earth would you want to waterproof concrete to a fence post?

As I said above, to stop the concrete from getting soaking, which would transmit moisture to the buried post.

 

[^woody^]

So the moisture travelling down the timber posts gets trapped and rots the timber you mean?

 

[Millwright]

Why not use Postcrete instead - manufactured for the task at hand and goes off very quickly...

As it's four times the price compared with mixing it myself and as I've got a lot to do we'd be talking a few hundred quid if I used that over priced dust. Concrete goes off in a reasonable time for posts anyway.

 

[limerockconstruction]

Sounds like you got the answers already then buddy.....! (BTW its only about £6 a bag, you must have a fence the length of Glastonbury's to do to make it unviable based on cost!)

Stock up on the PVA

 

[Millwright]

Sounds like you got the answers already then buddy.....!

Not really, you didn't say what to use, only to not use PVA.

(BTW its only about £6 a bag, you must have a fence the length of Glastonbury's to do to make it unviable based on cost!)

Indeed, there are a lot of fences to my property, the back garden is very long it would seriously be painful paying £6 a bag of that when I've got a mixer and can make it myself for about £1.50 for what one bag of that expensive stuff does.

Stock up on the PVA

What for? You said not to use it.

 

[limerockconstruction]

You don't need to waterproof the concrete
.

 

[ImayKnow]

. Use concrete posts, forget timber ones any way!

 

[Millwright]

. Use concrete posts, forget timber ones any way!

They're hard to work with, too heavy, you have to slide panels in, not nice. And as there's no give on them, if the wind is high enough, they snap!

 

[ImayKnow]

. Use concrete posts, forget timber ones any way!

They're hard to work with, too heavy, you have to slide panels in, not nice. And as there's no give on them, if the wind is high enough, they snap!

!

 

[limerockconstruction]

A fence as long at Michael Evis's and Gale force winds too match - why bother with a fence at all?

 

[Millwright]

A fence as long at Michael Evis's and Gale force winds too match - why bother with a fence at all?

To stop my slaves from escaping. I sense you don't like that I have a long one

 

[freddiemercurystwin]

Waterproof concrete is not created by adding some PVA. Meticulous quality control and adding tons of reinforcement are the way to go. Totally potty for some fence posts. Furthermore if it were that simple the whole industry that surrounds tanking concrete would not exist.