Flat Roof woes!!

harryspotter · 12 Jul 2014

Hi , I have a flat roof that will be the walkway, roof garden etc for 5 flats. 85sqm in total. I have just had it refelted thinking this was the best option. I can see within 2 weeks it won't stand up to the daily activities of 5 couples trampling across it. I need to do something about it. As far as I see my options are possibly -

1. use a rubber paint suitable for roof terrace / balconies - Will I need to seal the roof first with a primer or sealant like G4?
2. Somehow use GRP. Is it possible to seal it again and then use GRP or do I need to reboard first? If so what do I reboard with?
3. Any alternative suggestions would be good. I have spent a small fortune on the roof already so try to keep cost down?

Thanks

Mark

freddiemercurystwin · 12 Jul 2014

A felt finish is wholly unsuitable for daily use. It needs a protective layer, paints will be a waste of money and the GRP option is well, not an option really. You could use promenade tiles to protect the felt eg http://www.spartanpromenadetiles.co.uk/promenade-tiles# or decking on battens or paving slabs on paving supports, though the latter two will be heavy so you would need to be weary of adding the additional weight and need to seek structural advice before pursuing each of those two options.

harryspotter · 12 Jul 2014

I really feel as though I need to add something else to the roof. I suppose the thing I was thinking about was something like this but this is to expensive
http://www.roofingsuperstore.co.uk/...rtzdek/acrypol-quartzdek-resin-5kg-clear.html

Also, with regards to GRP, is it possible to overboard the felt and put GRP down?

Mark

catlad · 12 Jul 2014

Do not waste your money on that stuff, you may as well buy a 100 rubber door mats.

dilly · 13 Jul 2014

What you could do is remove the felt,and put down a 11mm osb3 board and fibreglass the roof deck.You would then have the option off either having grit added to the deck to make it anti slip.Your contractor should be able to offer further options as there are several.As with all roofing membranes they are only as good as the installers installing them so you should choose a company that uses a BBA approved system and comes with a insurance backed guarantee,that way you should avoid the cowboys,try polyroof the have many systems.

freddiemercurystwin · 13 Jul 2014

dilly said:
What you could do is remove the felt,and put down a 11mm osb3 board and fibreglass the roof deck.You would then have the option off either having grit added to the deck to make it anti slip.

That's still an unsuitable finish for a roof being used as a garden/leisure space with chair legs, high heels etc etc. Whatever the finish it needs a protective barrier to prevent damage.

dilly · 13 Jul 2014

As I said discuss with the contractor for the various options available,there are many options available.your comment shows your lack of knowledge of liquid systems on the market.

freddiemercurystwin · 13 Jul 2014

dilly said:
As I said discuss with the contractor for the various options available,there are many options available.your comment shows your lack of knowledge of liquid systems on the market.

There is absolutely no point ripping up a perfectly good felt finish (which he's just laid) to lay a new grp finish and then add a protective layer to it. Its more economic and easier to just add a protective barrier to what he's got!

dilly · 13 Jul 2014

For your education go to the polyroof site triflex and kempur sites there you will see options available for the application of these systems there are many that do not require the removal of the old deck assuming it is well and correctly laid and the balcony is correctly constructed to take all this weight.That is why I have pointed the chap in the direction of polyroof so the contractor can make the correct choice of covering.You are assuming that the felt laid has been done correctly and also if this last contractor was up to the job and he knew what the purpose of the balcony was why on earth did he specify felt

freddiemercurystwin · 13 Jul 2014

dilly said:
What you could do is remove the felt,and put down a 11mm osb3 board and fibreglass the roof deck.

Oh yes you are so well educated, Yes I bow to your superior knowledge! Keep on googling mate ....

harryspotter · 13 Jul 2014

Thanks for the replies. I have looked at many systems, some make it clear that they are not suitable for foot traffic, others make it clear that they are.

This one seems to be ideal.
http://www.seamlesscoatings.co.uk/brochures/SCL55CW.pdf

Mark

catlad · 13 Jul 2014

That looks suitable but it will be expensive.

freddiemercurystwin · 13 Jul 2014

I would put money on it that if you asked them to confirm if it will be suitable for applying to a built up felt roof that will need to used a leisure space they will say it is not suitable.

harryspotter · 13 Jul 2014

What makes you think it might be unsuitable?

Mark

harryspotter · 13 Jul 2014

How about this? -

I lay an extra protective seal such as some kind of rubber, then I create a path to each flat using some tiles. The majority of times they will keep to the paths only going off piste every now and then.

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Flat Roof woes!!

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