Green Screed

[paulvdavies]

Just a quickie. If using Green Screed to newish concrete should APD primer be applied? Cannot find any recommendation from BAL.
Thanks

 

[White Room]

I don't when I've used green screed adhesive

 

[paulvdavies]

Thanks for quick reply. Is it similar to Fastflex or easier to use?

 

[White Room]

Easy to use and mixes well, been a while since I've used it though

 

[paulvdavies]

Took me a while to track some down and then the cost at Topps was taking the perverbial. RRP price cheaper than SPF etc but after trade discount loads more expensive. Need to find out how those discounts are worked because it does not appear to have any logic?
Not had problems until this product....

 

[White Room]

Took me a while to track some down and then the cost at Topps was taking the perverbial. RRP price cheaper than SPF etc but after trade discount loads more expensive. Need to find out how those discounts are worked because it does not appear to have any logic?
Not had problems until this product....

Dos'nt add up:yikes:

 

[paulvdavies]

No queried the cost more than once. Will try to get hold of their head office in the next couple of days and see if the guy was just pulling a fast one. Took me an hour to get there so went with it but makes no sense at all. Plus me beer money has gone down the big hole...

 

[White Room]

They must have a mistake, I know my local topps don't even keep it in stock but will get it for you the next day or so.

You have a trade card I take it

 

[paulvdavies]

Yes have a card and prices pretty good or couldn't afford to use it!

 

[White Room]

Thats true:lol:

 

[dock]

I think you will find that green screed adhesives are recommended for use on "screed" not concrete

 

[Diamond Pool Finishers]

never used it yet, might do in time, i now use fast-track render/screeds so no need

 

[Ajax123]

I think you will find that green screed adhesives are recommended for use on "screed" not concrete

This is a bit confusing - perhaps you could explain the difference. Plain concrete is just screed with bigger aggregate surely....I wouild have thought that the adhesive could be used on both.

 

[paulvdavies]

BAL spec does confirm it is for new concrete and sand/cement screeds. Spoke to BAL technical department and was advised that it should not be primed as it could add a barrier to the evaporation. Hope it sticks!

 

[White Room]

Do tend to find that a lot of people call screed "concrete", screed is a topping to concrete.

 

[Ajax123]

BAL spec does confirm it is for new concrete and sand/cement screeds. Spoke to BAL technical department and was advised that it should not be primed as it could add a barrier to the evaporation. Hope it sticks!

That makes sense.

You prime the screed/concrete for two principal reasons.
1. to divorce different chemical substances e.g anhydrite form cement or gypsum finish from render. This one is irrelevent in this instance as it is cement on cement.
2. to reduce suction from the adhesive into the substrate. If the substrate is too dry it will suck the life out of the adhesive and cause it to "set" prematureley (false set) and subsequently fail. In the case of a green screed it will still be quite damp and so will not apply such a high level of suction to the adhesive. I see this effect in screeds direct onto concrete and concrete direct to hardcore where the application will always involve soaking the substrate with water to stop is "sucking" all the moisture from the topping.