painting Roofs?

[peteinwilts]

Hi Guys

Has anyone used a non permeable wood sealer for painting the outside of roof's, instead of pinning on another material??

Was it effective?

Cheers
Pete

 

[pargyle]

Hi Guys

Has anyone used a non permeable wood sealer for painting the outside of roof's, instead of pinning on another material??

Was it effective?

Cheers
Pete

Just interested ... why would you want to ? If your roofs are ply then the exposed cut edges (even with sealer) are going to let moisture into the end grain and will fail. If they are solid timber the likelihood is that they will have been made from jointed planks and the same water ingress at the joint lines could happen.

For what little either reclaimed metal or roofing felt costs I wouldn't waste time with non-permeable wood sealer ... it's generally not as non-permeable as the manufacturers would have you believe anyway !

 

[REDWOOD]

Not Me but there are some good ideas here
http://www.beekeepingforum.co.uk/showthread.php?t=22459

 

[peteinwilts]

I am nearly out of polycarbonate and works out about £6. I will be getting about 20 hives worth for free, but not for a few months

Looking for other options. The wood is 18mm softwood ply.

I was wondering about some sort of yachting varnish or something else thst can be painted on.
The rubber roof thread got me thinking

 

[pargyle]

I am nearly out of polycarbonate and works out about £6. I will be getting about 20 hives worth for free, but not for a few months

Looking for other options. The wood is 18mm softwood ply.

I was wondering about some sort of yachting varnish or something else thst can be painted on.
The rubber roof thread got me thinking

It's always the plywood edges that suffer - I really don't think there's a sensibly priced paint treatment that will do the job. Industrial Epoxy Floor paint or two pack polyurethane would do it but on a price per sq metre of treatment you would still be better off with roofing felt.

Although, I was looking at the sort of Heavy Duty Black Polythene sheeting that they use for damp proof membranes ... folds nicely at the edges and a few tacks to hold it in place - perhaps a bit of any old gloss paint on the roof before the polythene goes on. Would probably outlast roofing felt.

 

[itma]

What is the problem with the traditional solution of used (scrap) printing plates?

http://www.beekeepingforum.co.uk/showpost.php?p=210989&postcount=17
http://www.beekeepingforum.co.uk/showpost.php?p=54833&postcount=2

 

[Little John]

I was looking at the sort of Heavy Duty Black Polythene sheeting that they use for damp proof membranes ...

You really need to test a sample for UV stabilisation first - some is, some isn't. I inherited a property with numerous polytunnels and greenhouses - the bloke had used heavy black plastic sheeting on the floors - some has stood the test of time, some has disintegrated.

The Roll-Royce of covering would be a layer of polyester on top of a layer of glass matting - as is frequently done with wooden boats - but it isn't a cheap method.

I'm still using ex-caravan ally sheeting - Heath-Robinson would be proud.

LJ

 

[Tim1606]

Hi Guys

Has anyone used a non permeable wood sealer for painting the outside of roof's, instead of pinning on another material??

Was it effective?

Cheers
Pete

Someone in our association used something called gel coat to paint onto nuc roofs. I think it is something to do with fibreglass as i called a roofing firm and was quoted 20 odd quid for a 5 litre tin but didn't follow it up. If i see him i'll ask about it.

 

[pargyle]

Someone in our association used something called gel coat to paint onto nuc roofs. I think it is something to do with fibreglass as i called a roofing firm and was quoted 20 odd quid for a 5 litre tin but didn't follow it up. If i see him i'll ask about it.

Gelcoat is the smooth topcoat that you find on any item made out of glassfibre (Correctly GRP - Glass Reinforced Plastic). ie: the smooth white inside of a GRP shower tray or bath, or the smooth outer surface of glassfibre boats.

It usually comes as a white paste that has to be activated with a catalyst - once activated you have a limited time to use it.

Ideally it should be applied over a layer of clear resin with glassfibre matting in it to provide some structural integrity as, applied on its own it is not very good at withstanding movement - it can crack.

If you are going down this route then you might just as well use clear resin and glass mat as the only benefit from gelcoat is to provide a coloured surface. Gelcoat would normally be the first coat of resin applied inside a female mould to provide the smooth outer surface of the item being made.

 

[beebreeder]

Pete, Have you looked at beehive bits site, they do just the gavi covers 7.50 each, you could soon spend that on brush on short life products

 

[Tim1606]

Gelcoat is the smooth topcoat that you find on any item made out of glassfibre (Correctly GRP - Glass Reinforced Plastic). ie: the smooth white inside of a GRP shower tray or bath, or the smooth outer surface of glassfibre boats.

It usually comes as a white paste that has to be activated with a catalyst - once activated you have a limited time to use it.

Ideally it should be applied over a layer of clear resin with glassfibre matting in it to provide some structural integrity as, applied on its own it is not very good at withstanding movement - it can crack.

If you are going down this route then you might just as well use clear resin and glass mat as the only benefit from gelcoat is to provide a coloured surface. Gelcoat would normally be the first coat of resin applied inside a female mould to provide the smooth outer surface of the item being made.

As i said i don't know much about it, i just asked him what he used.
The lady he done them for is in Ireland for two weeks but i'll ask to look at them when she comes back just out of interest to see if they have cracked etc.

 

[Tim1606]

Pete, Have you looked at beehive bits site, they do just the gavi covers 7.50 each, you could soon spend that on brush on short life products

Have bought many bits from them and the roof covers are about a third less than big T

 

[Russel]

It's always the plywood edges that suffer - I really don't think there's a sensibly priced paint treatment that will do the job. Industrial Epoxy Floor paint or two pack polyurethane would do it but on a price per sq metre of treatment you would still be better off with roofing felt.

snip

Lidl do plastic floor paint, not sure if it's any good for your purpose but may be worth a look?

Lidl paint

 

[Little John]

Yachties - especially those with BIG boats - have a real problem when their sails get past their sell-by date: it's not cost-effective to re-cut them, and with the exception of some light weather genoas and spinnakers, the sailcloth is too heavy to pull 'em apart and make sails for smaller boats ... so disposal becomes a real problem.

A few years back I advertised for old worn-out or damaged sails, and a bloke gave me a complete suit of sails from his C&N 44 footer - they're bl##dy huge. The best bit was that he was grateful that the sail-cloth was to be re-cycled.

Ok - this stuff is rot-proof and more-or-less waterproof, as it's made from Terylene with a resin coating on either side.
It's fairly UV-stable, but not 100% - but - with a couple of coats of white gloss paint after tacking it in place like a litho plate - I reckon it would last for years. And little or no heat transfer either. And it's usually obtainable for free.

What's not to like ?

LJ

 

[pargyle]

Yachties - especially those with BIG boats - have a real problem when their sails get past their sell-by date: it's not cost-effective to re-cut them, and with the exception of some light weather genoas and spinnakers, the sailcloth is too heavy to pull 'em apart and make sails for smaller boats ... so disposal becomes a real problem.

A few years back I advertised for old worn-out or damaged sails, and a bloke gave me a complete suit of sails from his C&N 44 footer - they're bl##dy huge. The best bit was that he was grateful that the sail-cloth was to be re-cycled.

Ok - this stuff is rot-proof and more-or-less waterproof, as it's made from Terylene with a resin coating on either side.
It's fairly UV-stable, but not 100% - but - with a couple of coats of white gloss paint after tacking it in place like a litho plate - I reckon it would last for years. And little or no heat transfer either. And it's usually obtainable for free.

What's not to like ?

LJ

Actually, in days gone by, the exterior of cabin roofs on wooden boats used to be covered in canvas painted with white lead paint ... edges covered with a half round timber beading to hold it in place. Lasted many years with just an occasional repaint. Of course, these days you can't buy white lead paint but I reckon a modern white gloss would do just as well ...

Great idea ... now, who do I know with a big sailing boat ?

 

[Hombre]

Roof repair paint is probably very good for on top of your sail cloth roofing. If painted onto a sheet of paper, it would produce a 1.5 to 2mm skin that you would struggle to tear.

Hedgerow Pete would tell you that building paper that is used on the roofs of houses and on walls, is likely to have lots of offcuts at a local building project. If you see it being used, then someone to take away the waste possibly means less for them to get rid of in skips.

Don't ask, don't get. The worst you can get is told NO! Surprise yourself and reap the benefit.