Render mix - Confused HELP please!

Joined
22 Feb 2006
Messages
3
Reaction score
0
Location
Kent
Country
United Kingdom
Please guys help me! I have read so much about plasticisers, waterproofers, in the scratch coat, not in the scratch coat but in the top coat, hydrated lime or not.... HELP. Lime is very expensive, is it necessary 1:1 cement. Can I do without it all together?

Ok scratch coat 4 - sharp/plasterers sand to 1 cement
top coat 5 ditto 1 ditto

What thickness should each coat be? 7/8mm?

Please help with the lime, plasticiser, water proofer.

Thanks guys in advance, Barry
 
Sponsored Links
1: if you are using sand and cement then the lime you will be using will be hydrated, thats cheap as chips

2: scratch coat thickness depends on the trueness of the wall you are putting it on. (always use an integral waterproofer in your scratch coat) i don't care what anyone else says. don't add lime to the scratch coat and 4:1 is perfect

3: before the scratch coat check wall/walls for cracks or mortar movement, mesh these with stainless eml

4: 5:1:1 sand/lime/op and good plasticiser, don't get it too fluffy. NEVER put a stronger mix on top of a weaker mix

the waterproofer will 1: stop mortar joints ghosting through plus will give you time to edge up nice an flat and float at a reasonable pace. don't forget drip beads over windows and above dpc.

hope this helps
:)

ps get any organic material off first i.e. moss/algae/ivy etc and eml over any timber (forgot to mention that) plus if you have a straight mortar joint? put back to back stop beads for expansion/contraction
 

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
Sponsored Links
Back
Top