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Painting concrete window sills, surrounds, and roughcast walls in wet windy area
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Harold Davis
Sep 23, 2017, 8:39:30 AM9/23/17
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Hello,
I need to paint the concrete window sills and the window surrounds on my
roughcast kit bungalow near the Atlantic coast of the Isle of Lewis in
Scotland. They're painted at the moment but haven't been maintained for some
years. The sills I think have been done with some kind of matt external paint
and are crumbling but only very slightly and on the surface and not
sufficiently to require skimming. The surrounds have been done with something
more glossy.
The guy in the paintshop recommended a 3:1 water:PVA coat after scraping, and
then some Dulux Weathershield. He didn't seem to know much about SBR or
alternatives to that brand and type of paint.
Should I use PVA or SBR or something else? I thought for a while that maybe
he's right at least on the PVA score because a decent paint will soak into the
concrete which SBR being waterproof would hinder. I'd be grateful for advice
from some of the knowledgeable people here.
And what should I do about the surrounds?
Third question... The walls are roughcast and look mostly okay for the time
being although in places they are weather-stained and I plan to paint them. I
was thinking one coat of SBR followed by two coats of masonry paint. Does that
sound okay? Or would it amount to putting a vapour barrier on the cold side of
insulation and thereby muck up the ventilation something rotten? I'd like to
use paint that doesn't need to be recoated in the next 20-30 years.
Thanks in advance,
Harry
I need to paint the concrete window sills and the window surrounds on my
roughcast kit bungalow near the Atlantic coast of the Isle of Lewis in
Scotland. They're painted at the moment but haven't been maintained for some
years. The sills I think have been done with some kind of matt external paint
and are crumbling but only very slightly and on the surface and not
sufficiently to require skimming. The surrounds have been done with something
more glossy.
The guy in the paintshop recommended a 3:1 water:PVA coat after scraping, and
then some Dulux Weathershield. He didn't seem to know much about SBR or
alternatives to that brand and type of paint.
Should I use PVA or SBR or something else? I thought for a while that maybe
he's right at least on the PVA score because a decent paint will soak into the
concrete which SBR being waterproof would hinder. I'd be grateful for advice
from some of the knowledgeable people here.
And what should I do about the surrounds?
Third question... The walls are roughcast and look mostly okay for the time
being although in places they are weather-stained and I plan to paint them. I
was thinking one coat of SBR followed by two coats of masonry paint. Does that
sound okay? Or would it amount to putting a vapour barrier on the cold side of
insulation and thereby muck up the ventilation something rotten? I'd like to
use paint that doesn't need to be recoated in the next 20-30 years.
Thanks in advance,
Harry
Brian Gaff
Sep 24, 2017, 4:03:43 AM9/24/17
to
Well for that length of time I suspect the only thing that would work is one
of these professionally applied coatings. I'm not in an exposed area, but
this wallcoat stuff if done right seems to be very good. Not cheap but at
least to me only having two walls, cost effective.
Brian
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This newsgroup posting comes to you directly from...
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Blind user, so no pictures please!
"Harold Davis" <th...@is.not.a.real.email.address.invalid> wrote in message
news:XnsA7F98B125E...@85.214.115.223...
of these professionally applied coatings. I'm not in an exposed area, but
this wallcoat stuff if done right seems to be very good. Not cheap but at
least to me only having two walls, cost effective.
Brian
--
----- -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...
bri...@blueyonder.co.uk
Blind user, so no pictures please!
"Harold Davis" <th...@is.not.a.real.email.address.invalid> wrote in message
news:XnsA7F98B125E...@85.214.115.223...
Andrew Gabriel
Sep 26, 2017, 3:13:52 AM9/26/17
to
In article <XnsA7F98B125E...@85.214.115.223>,
> The surrounds have been done with something more glossy.
>
> The guy in the paintshop recommended a 3:1 water:PVA coat after scraping, and
> then some Dulux Weathershield. He didn't seem to know much about SBR or
> alternatives to that brand and type of paint.
Sounds like a bad idea. PVA isn't waterproof - it's water soluable.
Even EVA (external PVA) isn't waterproof, except inside mortar mixes.
SBR is, but I don't know about longevity in highly exposed situations.
Dulux Weathershield doesn't last long on masonry (from personal
experience).
I don't have an answer, but I would have thought a masonry paint would
be most appropriate and hence longer lasting.
> Should I use PVA or SBR or something else? I thought for a while that maybe
> he's right at least on the PVA score because a decent paint will soak into the
> concrete which SBR being waterproof would hinder. I'd be grateful for advice
> from some of the knowledgeable people here.
>
> And what should I do about the surrounds?
>
> Third question... The walls are roughcast and look mostly okay for the time
> being although in places they are weather-stained and I plan to paint them. I
> was thinking one coat of SBR followed by two coats of masonry paint. Does that
> sound okay? Or would it amount to putting a vapour barrier on the cold side of
> insulation and thereby muck up the ventilation something rotten? I'd like to
> use paint that doesn't need to be recoated in the next 20-30 years.
I think that's a bit of a challenge. For that sort of life, I
believe coloured renders are normally used.
--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]
Harold Davis <th...@is.not.a.real.email.address.invalid> writes:
> Hello,
>
> I need to paint the concrete window sills and the window surrounds on my
> roughcast kit bungalow near the Atlantic coast of the Isle of Lewis in
> Scotland. They're painted at the moment but haven't been maintained for some
> years. The sills I think have been done with some kind of matt external paint
> and are crumbling but only very slightly and on the surface and not
> sufficiently to require skimming.
Possibly masonry paint?
> Hello,
>
> I need to paint the concrete window sills and the window surrounds on my
> roughcast kit bungalow near the Atlantic coast of the Isle of Lewis in
> Scotland. They're painted at the moment but haven't been maintained for some
> years. The sills I think have been done with some kind of matt external paint
> and are crumbling but only very slightly and on the surface and not
> sufficiently to require skimming.
> The surrounds have been done with something more glossy.
>
> The guy in the paintshop recommended a 3:1 water:PVA coat after scraping, and
> then some Dulux Weathershield. He didn't seem to know much about SBR or
> alternatives to that brand and type of paint.
Even EVA (external PVA) isn't waterproof, except inside mortar mixes.
SBR is, but I don't know about longevity in highly exposed situations.
Dulux Weathershield doesn't last long on masonry (from personal
experience).
I don't have an answer, but I would have thought a masonry paint would
be most appropriate and hence longer lasting.
> Should I use PVA or SBR or something else? I thought for a while that maybe
> he's right at least on the PVA score because a decent paint will soak into the
> concrete which SBR being waterproof would hinder. I'd be grateful for advice
> from some of the knowledgeable people here.
>
> And what should I do about the surrounds?
>
> Third question... The walls are roughcast and look mostly okay for the time
> being although in places they are weather-stained and I plan to paint them. I
> was thinking one coat of SBR followed by two coats of masonry paint. Does that
> sound okay? Or would it amount to putting a vapour barrier on the cold side of
> insulation and thereby muck up the ventilation something rotten? I'd like to
> use paint that doesn't need to be recoated in the next 20-30 years.
believe coloured renders are normally used.
--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]
Dave Plowman (News)
Sep 26, 2017, 5:21:04 AM9/26/17
to
In article <XnsA7F98B125E...@85.214.115.223>,
coat, if the surface is absorbent.
I've just used Bedec which you can order from ToolStation. On advice from
here. Of course only time will tell if it lasts better than the previous
stuff - but it is certainly difficult to get the lid off a used tin. ;-)
But quite a bit more expensive than the common brands. It is said to
remain flexible and to 'breath' .
--
*Broken pencils are pointless.*
Dave Plowman da...@davenoise.co.uk London SW
To e-mail, change noise into sound.
Harold Davis <th...@is.not.a.real.email.address.invalid> wrote:
> The guy in the paintshop recommended a 3:1 water:PVA coat after
> scraping, and then some Dulux Weathershield. He didn't seem to know
> much about SBR or alternatives to that brand and type of paint.
> Should I use PVA or SBR or something else? I thought for a while that
> maybe he's right at least on the PVA score because a decent paint will
> soak into the concrete which SBR being waterproof would hinder. I'd be
> grateful for advice from some of the knowledgeable people here.
With a masonry paint. you'd normally just thin it with water for a primer
> The guy in the paintshop recommended a 3:1 water:PVA coat after
> scraping, and then some Dulux Weathershield. He didn't seem to know
> much about SBR or alternatives to that brand and type of paint.
> Should I use PVA or SBR or something else? I thought for a while that
> maybe he's right at least on the PVA score because a decent paint will
> soak into the concrete which SBR being waterproof would hinder. I'd be
> grateful for advice from some of the knowledgeable people here.
coat, if the surface is absorbent.
I've just used Bedec which you can order from ToolStation. On advice from
here. Of course only time will tell if it lasts better than the previous
stuff - but it is certainly difficult to get the lid off a used tin. ;-)
But quite a bit more expensive than the common brands. It is said to
remain flexible and to 'breath' .
--
*Broken pencils are pointless.*
Dave Plowman da...@davenoise.co.uk London SW
To e-mail, change noise into sound.
Mark
Sep 27, 2017, 12:12:11 PM9/27/17
to
> Harold Davis <th...@is.not.a.real.email.address.invalid> writes:
>> Hello,
>>
>> I need to paint the concrete window sills and the window surrounds on my
>> roughcast kit bungalow near the Atlantic coast of the Isle of Lewis in
>> Scotland. They're painted at the moment but haven't been maintained for
>> some
>>
>> Third question... The walls are roughcast and look mostly okay for the
>> time
>> being although in places they are weather-stained and I plan to paint
>> them. I
>> was thinking one coat of SBR followed by two coats of masonry paint. Does
>> that
>> sound okay? Or would it amount to putting a vapour barrier on the cold
>> side of
>> insulation and thereby muck up the ventilation something rotten? I'd like
>> to
>> use paint that doesn't need to be recoated in the next 20-30 years.
>
I use a Stabilising Solution which is not PVA or SBR on masonry
>> time
>> being although in places they are weather-stained and I plan to paint
>> them. I
>> was thinking one coat of SBR followed by two coats of masonry paint. Does
>> that
>> sound okay? Or would it amount to putting a vapour barrier on the cold
>> side of
>> insulation and thereby muck up the ventilation something rotten? I'd like
>> to
>> use paint that doesn't need to be recoated in the next 20-30 years.
>
https://www.toolstation.com/shop/Painting+%26+Decorating/d150/Masonry+Paint/sd3174/Sandtex+Stabilising+Solution/p75668
-
stuart noble
Oct 2, 2017, 2:37:29 PM10/2/17
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