you know if you were going to do some lime plastering?

[robgil]

and it was going to be a coat and a half? how can you judge how much materials you will need for that particular job? is there a way to calculate it?

 

[skier-hughes]

work out how much a coat is, divide by two, add two results together?

 

[robgil]

how do you work out how much a coat is?

 

[Schoolmarm]

work out half then double it. :lol:

 

[OddJob]

how do you work out how much a coat is?

Depends on the surface you're laying on to.
On lath it will take more than on brick.
I mostly buy mine ready mixed in 25k bags and for a recent 10m2 three coat job on brick it was estimated at 10 bags haired first coat,6 bags haired second coat,3 bags finish coat.
This is a premixed wet mix,not dry.
I know it's not a good indicator but the best way to go if you're not sure is do a test area and see how far it goes on the scratch coat then multiply.
As a rule I under order and get more if I need it.
I over ordered once by nearly double :shock:
Thankfully it was used on the same job the following spring.

 

[skier-hughes]

If you're using it for haired plaster you can store it with the hair in but I'd use it inside a month-six weeks as the hair rots away in the wet pug,I prefer to mix hair in on the day of use with a larry or in a mixer but ready haired does save a lot of time.

I mostly buy mine ready mixed in 25k bags and for a recent 10m2 three coat job on brick it was estimated at 10 bags haired first coat,6 bags haired second coat,.......................
I over ordered once by nearly double
Thankfully it was used on the same job the following spring.

 

[Schoolmarm]

oooops.

 

[Penners]

work out half then double it.

You see? That's the kind of in-depth technical expertise that you wouldn't get anywhere else. It's solid gold.

 

[Schoolmarm]

I was laughing loudly, alone in the kitchen whilst posting that little gem. 8)

 

[OddJob]

If you're using it for haired plaster you can store it with the hair in but I'd use it inside a month-six weeks as the hair rots away in the wet pug,I prefer to mix hair in on the day of use with a larry or in a mixer but ready haired does save a lot of time.

I mostly buy mine ready mixed in 25k bags and for a recent 10m2 three coat job on brick it was estimated at 10 bags haired first coat,6 bags haired second coat,.......................
I over ordered once by nearly double
Thankfully it was used on the same job the following spring.

Not quite sure how that can be seen as an oops!
I said I mostly buy it in 25k bags,I didn't say I mostly buy it haired,the batch in question was supplied haired and the quantity estimated by the supplier,only the second time I've had it ready haired,I still prefer to mix in hair fresh :mrgreen:

 

[Schoolmarm]

It was an ooops if all the hair melted.

 

[skier-hughes]

Wouldn't it be an ooops if the reputation was squandered on using aged ready mixed plaster that had gone off, or an Oooops for having to do the same job again the next spring, when perhaps it should have been done right first time?

 

[Schoolmarm]

Ah, an extra ooops for that. Didn't spot it. :lol:

 

[OddJob]

Wouldn't it be an ooops if the reputation was squandered on using aged ready mixed plaster that had gone off, or an Oooops for having to do the same job again the next spring, when perhaps it should have been done right first time?

Nope,the overordered plaster was unhaired,even if it was haired all you have to do is add more hair,and the plaster itself was even better for having matured in the bag.
It was indeed used on the same job the following spring but a different wing of the house,not even a hairline crack in it 6 years later :lol:

 

[robgil]

so how do you estimate how much you will need? i understand that i can multiply average depth by area which will give me an idea of how much plaster i need but how do i know , for instance how much plaster i can get from one bag of lime putty and 2 bags of sharp sand?

 

[MdB]

so how do you estimate how much you will need? i understand that i can multiply average depth by area which will give me an idea of how much plaster i need but how do i know , for instance how much plaster i can get from one bag of lime putty and 2 bags of sharp sand?

I've no idea if the this is the recommended way but I go by the volume of sand (*). A builders bucket is typically 15l so a buckets worth of sand / mortar is enough to cover 1.5m^2 at a depth of 10mm. A jumbo bag is something like half a cubic metre so it will cover something like 50m^2 at 10mm depth (corrections please).

(*) Adding one part putty to two parts sand will end up with close to two parts mortar as the putty fills in the gaps between the sand.

 

[robgil]

Cheers Mdb.

 

[kevmiles1]

A general rule of thumb is that a tonne of lime mortar (haired or unhaired) will do approx 40m2 one coat 10mm thick, so work out how many m2 you have to plaster and work it out from there, I would slightly over order tho as you may need to dob out, and it also depends on the background, hope that helps?