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Posted: Mon Jan 26, 2009 9:02 pm
by peterbert
I am currently having my drive blocked. The company has now mentioned putting a sealant on the blocks to prevent moss growing as i have a variety of large trees around me -including pine. Is it something i should consider, will the trees cause moss/mould to appear on the blocks? I did have a concrete drive and can't say moss/mould was a problem.
If a sealant is recommended what sort should be used and when should it be applied?
Posted: Mon Jan 26, 2009 9:23 pm
by msh paving
its the wrong time of year to seal a drive way you need 3days dry weather and no rain while putting it on,
you will have a choice of gloss or matt finish resiblock is most well known and the most expensive about £100 five gallons then tools to apply,e.g. paint roller and solvent, in my opinion i would not seal a block paved drive way, to stop moss all you need is a good brush off every few weeks to get rid off dirt and soil from car tyres
as long as it is laid with correct fall's so water gets away moss wont grow on dry paving,
5 years ago all my customers asked to be sealed as it was the in thing iv not sealed one in 3 years now,my opinion is blocks don't need to be sealed as they are concrete
once its sealed your stuck with finished glossy or matt blocks 
Posted: Mon Jan 26, 2009 10:16 pm
by peterbert
Thanks
youve put my mind at rest
Posted: Sun Feb 22, 2009 9:54 pm
by cw76
I wouldn't bother sealing a blocked drive either, but I believe Kilsaran/Roadstone (cant remember which) does some sort of sealant that's not noticable to the eye (its neither Matt nor Gloss) but i've never seen it so dont know how true this is.
But in relation to the moss, there are enviromently friendly Moss killers (DE-Moss is the one i know and worked with) where this can be used on drives/footpaths/walls/roofs and the runnoff does not affect root growing plants and you dont have to worry about the runnoff. and once applied it can keep moss from growing back for about 3-4 years depending on your site conditions tho... (always do a test area first)
But if you've already said you didn't have a moss problem previously I'd be suprised you'd have one now...
Posted: Mon Feb 23, 2009 9:08 pm
by Pablo
Kilsaran but it's not available in the UK. It's a water based sealant not solvent so isn't affected by dampness when applied. Water based paving sealers are fairly readily available.
Posted: Tue Feb 24, 2009 11:53 am
by Tony McC
Not only is it the wrong time of year to be applying a sealant to any paving, it's too soon after construction. Paving needs time to 'settle in', for any faults to make themselves evident, for any efflorescence to pass, and for the jointing to prove itself. I'd never, ever seal a modular pavement until it was at least 4 months old.
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