Re Jointing a Patio

[chasingracecars]

Quick question, how much sand will I need to re-joint around 150sqM of patio with gaps around 20mm.

Generally working on the 6:1 ratio with Cement.

If I can I will get bulk bags delivered but don't want to go too overboard nor run out by miles.

Thanks.

[BaldOldMan]

Depends how big your slabs are and how deep your mortar will be.....

It’s somewhat basic maths - length x width x depth will tell you how many square meters you need.......

[chasingracecars]

Yes good point. Slabs are around 40cm square about 2cm deep. Plan is to start tomorrow due to some sudden extra hands.

[BaldOldMan]

Ok - so as a quick approximation let’s call it 160m2 - and square - so 40m x 40m so @ 40cm slabs that’s 100x100 slabs

So you have 100 horizontal +100 vertical mortar lines (well 99 really but that makes the maths harder)

200 lines x 40m x 0.02m wide x 0.02m deep = 3.2m3

So I’d say somewhere just under 3 cubic metres of sand

But please check my maths as i’ve been on the whisky.......

[beedj]

BaldOldMan said:

Ok - so as a quick approximation let’s call it 160m2 - and square - so 40m x 40m so @ 40cm slabs that’s 100x100 slabs

So you have 100 horizontal +100 vertical mortar lines (well 99 really but that makes the maths harder)

200 lines x 40m x 0.02m wide x 0.02m deep = 3.2m3

So I’d say somewhere just under 3 cubic metres of sand

But please check my maths as i’ve been on the whisky.......

Err, 40m x 40m = 1600m2 - so 10x too much!?!

[dickymint]

If you're starting tomorrow then I take it you haven't raked it out yet? Just order 1/2 ton then take it from there.

[chasingracecars]

Yes all cleaned out today, then patio slabs pressure washed and joints cleared. Local place normally does same day deliveries.

[Sir Bagalot]

dickymint said:

If you're starting tomorrow then I take it you haven't raked it out yet? Just order 1/2 ton then take it from there.

I make it half that

I recently done 38 slabs roughly same size and used less than 1 bag (don't know weight but Major bag from Wickes @ £1.80). I used a 5:1 mix, but my gaps were less than 20mm. 10/15mm

[chasingracecars]

Local building merchants delivered 1tonne of sand at 1000 this morning! (Smallest order quantity but still cheap) One thing clear will not need a tonne but progress went well over 50% done.

Any one need any sand?

[phil_cardiff]

How are you applying it? In my younger days I brushed it in dry and then sprinkled it with water. Made a hell of a mess!

[chasingracecars]

phil_cardiff said:

How are you applying it? In my younger days I brushed it in dry and then sprinkled it with water. Made a hell of a mess!

Yep doing exactly that. Doesn’t look too bad.

[dickymint]

chasingracecars said:

phil_cardiff said:

How are you applying it? In my younger days I brushed it in dry and then sprinkled it with water. Made a hell of a mess!

Yep doing exactly that. Doesn’t look too bad.

It won’t last! Especially if you use a jet washer to clean your slabs.

I’m using “easy joint” on my new patio probably this weekend. I used Silka brush in stuff on my neighbours last year which was pretty good but still had to compact it with a trowel then brush in more and “strike” it.

Easyjoint has to be kept continuously wet. The water helps take the compound right down.

Edit: this stuff.....

https://youtu.be/7oBSc-KK2EE

Edited by dickymint on Tuesday 20th August 12:49

[Aluminati]

dickymint said:

It won’t last! Especially if you use a jet washer to clean your slabs.

I’m using “easy joint” on my new patio probably this weekend. I used Silka brush in stuff on my neighbours last year which was pretty good but still had to compact it with a trowel then brush in more and “strike” it.

Easyjoint has to be kept continuously wet. The water helps take the compound right down.

Edit: this stuff.....

https://youtu.be/7oBSc-KK2EE

Edited by dickymint on Tuesday 20th August 12:49

This. Not cheap, but worth it in labour saving alone !

[PAT64]

dickymint said:

It won’t last! Especially if you use a jet washer to clean your slabs.

I’m using “easy joint” on my new patio probably this weekend. I used Silka brush in stuff on my neighbours last year which was pretty good but still had to compact it with a trowel then brush in more and “strike” it.

Easyjoint has to be kept continuously wet. The water helps take the compound right down.

Edit: this stuff.....

https://youtu.be/7oBSc-KK2EE

Edited by dickymint on Tuesday 20th August 12:49

I am intrigued with Silka setting sand how is your neighbors patio doing, any grass or weeds or issues ?

I read up on Easyjoint it does look good but one reviewer said its not good for stopping weeds/grass and moss build up, while Silka setting sand is meant to aid better in that but not sure it would stop mother nature.

I may give Silka sand and ammonium sulphamate sprayed on each year and a good stiff brush every now and then on my patios.