I'm not sure if it's a construction or painting issue but I'd like a more
long lasting solution.

It's a purpose built 2nd floor window which is approx 11 x 7ft consisting
of 15 2ft square double glazed panels. The frame work is made from 3 3/4 x
1 3/4" throughout and is load bearing - the flat roof joists are in part
supported by it. The glazing is secured by planted on beads on both sides
- which I think are stop beads as used on a sash window.

Access is difficult as it's above a conservatory so requires scaffolding.
It faces south so gets hit hard by all types of weather.

I've painted it myself and had it done professionally but the results are
the same - it looks scruffy after only a couple of years. And the glazing
beads need replacing through rot after 5 or so. The main structure seems
to be ok.

So is there a better design of bead that would have a longer life -
perhaps a better wood than my local yard supplies as a stock moulding or
even PVC? It's worst on the bottom rails where the water must lie and get
under the paint.

Last time I replaced the beads I soaked them in Cuprinol for some time
before fitting but after cutting to size - but this doesn't seem to have
extended their life or done anything for the paint adhesion.

--
*Virtual reality is its own reward*

Dave Plowman London SW
To e-mail, change noise into sound.

On Nov 4, 1:39 pm, "Dave Plowman (News)" wrote:
I'm not sure if it's a construction or painting issue but I'd like a more
long lasting solution.

It's a purpose built 2nd floor window which is approx 11 x 7ft consisting
of 15 2ft square double glazed panels. The frame work is made from 3 3/4 x
1 3/4" throughout and is load bearing - the flat roof joists are in part
supported by it. The glazing is secured by planted on beads on both sides
- which I think are stop beads as used on a sash window.

Access is difficult as it's above a conservatory so requires scaffolding.
It faces south so gets hit hard by all types of weather.

I've painted it myself and had it done professionally but the results are
the same - it looks scruffy after only a couple of years. And the glazing
beads need replacing through rot after 5 or so. The main structure seems
to be ok.

So is there a better design of bead that would have a longer life -
perhaps a better wood than my local yard supplies as a stock moulding or
even PVC? It's worst on the bottom rails where the water must lie and get
under the paint.

Last time I replaced the beads I soaked them in Cuprinol for some time
before fitting but after cutting to size - but this doesn't seem to have
extended their life or done anything for the paint adhesion.

--
*Virtual reality is its own reward*

Dave Plowman London SW
To e-mail, change noise into sound.

Hi,

Were the beads primed all round (on all faces) and particularly the
end grain, before fitting?

Also can you remember what primer and topcoat was used?

cheers,
Pete.

Dave Plowman (News) wrote:
I'm not sure if it's a construction or painting issue but I'd like a more
long lasting solution.

It's a purpose built 2nd floor window which is approx 11 x 7ft consisting
of 15 2ft square double glazed panels. The frame work is made from 3 3/4 x
1 3/4" throughout and is load bearing - the flat roof joists are in part
supported by it. The glazing is secured by planted on beads on both sides
- which I think are stop beads as used on a sash window.

Access is difficult as it's above a conservatory so requires scaffolding.
It faces south so gets hit hard by all types of weather.

I've painted it myself and had it done professionally but the results are
the same - it looks scruffy after only a couple of years. And the glazing
beads need replacing through rot after 5 or so. The main structure seems
to be ok.

So is there a better design of bead that would have a longer life -
perhaps a better wood than my local yard supplies as a stock moulding or
even PVC? It's worst on the bottom rails where the water must lie and get
under the paint.

Last time I replaced the beads I soaked them in Cuprinol for some time
before fitting but after cutting to size - but this doesn't seem to have
extended their life or done anything for the paint adhesion.


I think I'd be looking for a pvc moulding. Any wood in that small a
section is going to rot pretty quickly.
You're presumably not that bothered about the profile, as long as it's
wide enough to hold the glass and fix easily to the frame. A 15mm scotia
maybe? What trade uses that kind of thing? Flooring?

Beads...
a) Dulux Trade Preservative, blue cobalt/copper smelly muck
b) Hardwood shaped to suit
c) Use putty compatible with your glazing

I would find a putty compatible with your glazing and use...
a) Dulux Trade Weathershield Preservative / Undercoat / Topcoat
---- wide choice of colours, choose white ideally re life
---- best looking Year-1, not as good Year 3+
---- flakes off, requires stripping/sanding as not overcoatable
b) Sikkens Preservative / Onol / Rubbol AZ
---- choice of colours is minimal
---- not as good looking as Dulux Year-1, better Year 2-6
---- overcoatable paint which chalks

Akzo Nobel (Sikkens) have bought ICI Paints as I recall,
so watch for smelly-good replaced by eco-water-based.

Sikkens Rubbol AZ is a gloss, Satura is the Satin.
It is the most violently smelly paint you can imagine.
It does not spread well, requires a synthetic brush and
the film thickness is quite critical to get the full lifespan.
Can be overcoated about 4-5x (about 20-30yrs or so).

Sikkens Rubbol BZ requires *perfect* wood or it will
tend to not adhere, this is very true for hardwoods.

Sikkens Onol Express is the fast-dry low-temp undercoat.

The longest life paint is I think Permaglaze MVP, the
next best is Sikkens. Can not recall if the Permaglaze
is overcoatable, it may be the scrape/sand off (tedious).

We are South facing and whilst that means minimal
heating is required, paint takes a lot of heat baking.
Sikkens Rubbol seems to weather the best, although
removing windows & painting horizontally is cheating.

Stainless steel hinges are your friend, 2" are available
if you hunt them down and suit windows 1940s-on.

Wooden beading never lasts unless Cuprinol Duckback,
which is more for sheds - although they do a "cream"?
Putty on the other hand allows windows to survive
even left-to-flake completely (ok, kiln dried wood).
Radius corners properly - for Dulux W especially.
--
DB.

On 4 Nov, 13:39, "Dave Plowman (News)" wrote:
I'm not sure if it's a construction or painting issue but I'd like a more
long lasting solution.

It's a purpose built 2nd floor window which is approx 11 x 7ft consisting
of 15 2ft square double glazed panels. The frame work is made from 3 3/4 x
1 3/4" throughout and is load bearing - the flat roof joists are in part
supported by it. The glazing is secured by planted on beads on both sides
- which I think are stop beads as used on a sash window.

Access is difficult as it's above a conservatory so requires scaffolding.
It faces south so gets hit hard by all types of weather.

I've painted it myself and had it done professionally but the results are
the same - it looks scruffy after only a couple of years. And the glazing
beads need replacing through rot after 5 or so. The main structure seems
to be ok.

So is there a better design of bead that would have a longer life -
perhaps a better wood than my local yard supplies as a stock moulding or
even PVC? It's worst on the bottom rails where the water must lie and get
under the paint.

Last time I replaced the beads I soaked them in Cuprinol for some time
before fitting but after cutting to size - but this doesn't seem to have
extended their life or done anything for the paint adhesion.

--
*Virtual reality is its own reward*

Dave Plowman London SW
To e-mail, change noise into sound.

Dear Dave
There is no point in soaking in cuprinol and then cutting

Best is to use a grade 5 durable timber as described in the BRE Digest
on porosity and durability eg iroko teak etc provided it is heart wood
or
if using softwood make it Scots pine and cut it all to shape first
then double vac treat it
If not double vac treat put each end grain in liquid , preferably,
overnight (min 60 mins)
mount in non setting butyl or similar mastic used for double glazing

On the sills and sub sills make sure there is a 10 degree slope and
drip groove

I completely endorse all the other posts with reference to
Weathershield primer ( Dorothy Bradbury) ( but not the specification
of "hardwood" - Balsa is one!) and decent arrises (10mm for sills)
and I recommend the Dulux OS paint system FOLLOWED by a coat of
Sikkens Water repellant preservative stain which I put on every two
years leaving the gloss underneath. The advantage is that it fails by
chalking and you need no preparation when repainting
I appreciate that with the conservatory below this is difficult but
would recommend either a purpose built access or opening window

BTW I think that aluminium bead would be a good choice for the bottom
bead, with cutouts to drain any trapped water.

For paint I'd look into Sadolin Superdec/Woodshield which comes in
satin or gloss:

http://www.sadolin.co.uk/homeowner/products/garden/
superdecopaquewoodprotection/description

cheers,
Pete.

In article . com,
wrote:
Last time I replaced the beads I soaked them in Cuprinol for some time
before fitting but after cutting to size - but this doesn't seem to
have extended their life or done anything for the paint adhesion.

Dear Dave
There is no point in soaking in cuprinol and then cutting

That's why I cut them first then soaked. As I said. ;-)

Best is to use a grade 5 durable timber as described in the BRE Digest
on porosity and durability eg iroko teak etc provided it is heart wood
or if using softwood make it Scots pine and cut it all to shape first
then double vac treat it If not double vac treat put each end grain in
liquid , preferably, overnight (min 60 mins) mount in non setting butyl
or similar mastic used for double glazing

Problem is all I've seen is the one type of moulding on sale - both in the
sheds and Travis Perkins. No idea what the wood is. It seems closer
grained than the ordinary stuff you get, though. The original stuff was
fitted under the supervision of the architect who designed everything -
but it lasted no better than the stuff I replaced it with. So where do I
buy this sort of spec timber?

On the sills and sub sills make sure there is a 10 degree slope and
drip groove

I wondered about that. The sill is a standard hardwood moulding of the
type most yards sell. The other two horizontals are just plain PAR - so no
slope. And the planted on bead has no slope either.

I completely endorse all the other posts with reference to
Weathershield primer ( Dorothy Bradbury) ( but not the specification
of "hardwood" - Balsa is one!) and decent arrises (10mm for sills)
and I recommend the Dulux OS paint system FOLLOWED by a coat of
Sikkens Water repellant preservative stain which I put on every two
years leaving the gloss underneath. The advantage is that it fails by
chalking and you need no preparation when repainting

Right.

I appreciate that with the conservatory below this is difficult but
would recommend either a purpose built access or opening window

To alter the design would be extremely expensive - as I said it is load
bearing. And it goes from floor to ceiling so a conventional opening
window - or at least anything big enough to give access to the outside
would be plain dangerous. At the moment there are three top hung opening
panels.

--
*A person who smiles in the face of adversity probably has a scapegoat *

Dave Plowman London SW
To e-mail, change noise into sound.

In article . com,
Pete C wrote:
Last time I replaced the beads I soaked them in Cuprinol for some time
before fitting but after cutting to size - but this doesn't seem to
have extended their life or done anything for the paint adhesion.

Were the beads primed all round (on all faces) and particularly the
end grain, before fitting?

I can't really say about the original installation as it was painted by
the builders - but was when I did it subsequently.

Also can you remember what primer and topcoat was used?

I've re-done it 3 times and a pro once. I've had Wicks, B&Q and Dulux wood
primer (pink) around at various times and it will be one of those. The
undercoat and gloss will have been similar. I've not noticed much of a
difference in life with any of these. The pro seemed to swear by Dulux.
His efforts have lasted less well than mine. ;-)

--
*Growing old is inevitable, growing up is optional *

Dave Plowman London SW
To e-mail, change noise into sound.

In article ,
Stuart Noble wrote:
Last time I replaced the beads I soaked them in Cuprinol for some time
before fitting but after cutting to size - but this doesn't seem to
have extended their life or done anything for the paint adhesion.


I think I'd be looking for a pvc moulding. Any wood in that small a
section is going to rot pretty quickly.
You're presumably not that bothered about the profile, as long as it's
wide enough to hold the glass and fix easily to the frame. A 15mm scotia
maybe? What trade uses that kind of thing? Flooring?

I was hoping there might be a suitable material that wouldn't need
painting - but the original bead is shaped like a P where the leading edge
goes to the glass - so will hopefully help to stop water getting into the
join between it and the sill. And would an alternative to wood - PVC, ally
etc expand and contract differently so just allow bigger gaps to develop?
Or could it be set in some form of pliable gunge like silicone?

--
*Keep honking...I'm reloading.

Dave Plowman London SW
To e-mail, change noise into sound.

On Nov 4, 6:20 pm, "Dave Plowman (News)" wrote:
Also can you remember what primer and topcoat was used?

I've re-done it 3 times and a pro once. I've had Wicks, B&Q and Dulux wood
primer (pink) around at various times and it will be one of those. The
undercoat and gloss will have been similar. I've not noticed much of a
difference in life with any of these. The pro seemed to swear by Dulux.
His efforts have lasted less well than mine. ;-)

Fair enough, I'd try the Sadolin stuff I mentioned in the other post,
they have a product data sheet for download which has some good tips.

It looks like it's basically a water based opaque wood stain so works
differently from normal oil based primer/topcoat paints.

When choosing a wood preservative, it's worth doing a little research
on the active ingredients as some are better than others.

cheers,
Pete.

On Sun, 04 Nov 2007 13:39:48 +0000, Dave Plowman (News) wrote:

I'm not sure if it's a construction or painting issue but I'd like a
more long lasting solution.

It's a purpose built 2nd floor window which is approx 11 x 7ft
consisting of 15 2ft square double glazed panels. The frame work is made
from 3 3/4 x 1 3/4" throughout and is load bearing - the flat roof
joists are in part supported by it. The glazing is secured by planted on
beads on both sides - which I think are stop beads as used on a sash
window.

Access is difficult as it's above a conservatory so requires
scaffolding. It faces south so gets hit hard by all types of weather.

I've painted it myself and had it done professionally but the results
are the same - it looks scruffy after only a couple of years. And the
glazing beads need replacing through rot after 5 or so. The main
structure seems to be ok.

So is there a better design of bead that would have a longer life -
perhaps a better wood than my local yard supplies as a stock moulding or
even PVC? It's worst on the bottom rails where the water must lie and
get under the paint.

Last time I replaced the beads I soaked them in Cuprinol for some time
before fitting but after cutting to size - but this doesn't seem to have
extended their life or done anything for the paint adhesion.

==================================
Use a beading made from ordinary softwood. Paint each piece fully (use
something like the Focus equivalent of Sadolin - appears to be better than
Sadolin) before fitting. When fitting, apply a generous bead of ordinary
frame sealant on all inner surfaces of each piece (including ends) so that
it squeezes in / out to fill all cavities. Overpaint with same as
originally used when the frame sealant has skinned over.

If you can make your own beading consider making one that projects (by
about 1/4") beyond the beading reveal - effectively creating an all round
drip. I used this method when making my front porch about 5 years ago and
it hasn't required any treatment since.

For access see here for a cantilevered access platform:

http://i181.photobucket.com/albums/x...s/DSCI0012.jpg

Cic.

--
===================================
Using Ubuntu Linux
Windows shown the door
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