OK,

I moved into my house about a year ago. I insulated the half of the
loft in January with the orange and silver kauff insulation from B and
Q, the other half of the loft was alredyinsulated with rockwool (with
no orange / silver covering) and put a box up there a week ago, a week
later I got the box down and it was damp.

On closer inspection I can see a bit of condensation on the roof felt
at the apex. Having read a few posts on condensation etc I have noted
the following which is probably contributed to this.

I have no door on my bathroom, have fitted a new mira excel shower off
the new combi boiler in there, the foft hatch is just outside the door.
I have no extractor in the bathroom.

There are a few holes in the ceiling where there were pipes to the
water tank which is now redundant.

In the bathroom I have spotlights which have a small gap around them
where they can pivot.

I have no "vapour barrier" in the loft.

In the year I have had cavity wall insulation done which goes right up
to the apex of the gable ends.

There are no air bricks in the loft, but there is a good flow of air
through there (I can see the cobwebs quivering in the wind) I didnt
insulate into the eaves.

Obviously I want to solve the problem. HOwever I am just after some
opinions as what to tackle first, some soloutions are easy (bathroom
door!) some are harder (bathroom extractor) and some I'm not convinced
will be a major benefit (I dont know anyone who put down a vapour
barrier under their insulation)

Also does the polythene around my new insulation not act as a vapour
barrier already?

I'd appreciate any ideas on what I should tacklle first / how to
approach this.

Thanks.

"dp" wrote in message
ups.com...
OK,

I moved into my house about a year ago. I insulated the half of the
loft in January with the orange and silver kauff insulation from B and
Q, the other half of the loft was alredyinsulated with rockwool (with
no orange / silver covering) and put a box up there a week ago, a week
later I got the box down and it was damp.

On closer inspection I can see a bit of condensation on the roof felt
at the apex. Having read a few posts on condensation etc I have noted
the following which is probably contributed to this.

I have no door on my bathroom, have fitted a new mira excel shower off
the new combi boiler in there, the foft hatch is just outside the door.
I have no extractor in the bathroom.

There are a few holes in the ceiling where there were pipes to the
water tank which is now redundant.

In the bathroom I have spotlights which have a small gap around them
where they can pivot.

I have no "vapour barrier" in the loft.

In the year I have had cavity wall insulation done which goes right up
to the apex of the gable ends.

There are no air bricks in the loft, but there is a good flow of air
through there (I can see the cobwebs quivering in the wind) I didnt
insulate into the eaves.

Obviously I want to solve the problem. HOwever I am just after some
opinions as what to tackle first, some soloutions are easy (bathroom
door!) some are harder (bathroom extractor) and some I'm not convinced
will be a major benefit (I dont know anyone who put down a vapour
barrier under their insulation)

Also does the polythene around my new insulation not act as a vapour
barrier already?

I'd appreciate any ideas on what I should tacklle first / how to
approach this.

Wait until after next week :-)

Mary

Thanks.

dp wrote:
OK,

I moved into my house about a year ago. I insulated the half of the
loft in January with the orange and silver kauff insulation from B and
Q, the other half of the loft was alredyinsulated with rockwool (with
no orange / silver covering) and put a box up there a week ago, a week
later I got the box down and it was damp.

On closer inspection I can see a bit of condensation on the roof felt
at the apex. Having read a few posts on condensation etc I have noted
the following which is probably contributed to this.

I have no door on my bathroom, have fitted a new mira excel shower off
the new combi boiler in there, the foft hatch is just outside the
door. I have no extractor in the bathroom.

There are a few holes in the ceiling where there were pipes to the
water tank which is now redundant.

In the bathroom I have spotlights which have a small gap around them
where they can pivot.


This may contribute to it but it will only be slight...you might want to fit
an extractor fan in the bathroom, and it would probably be a good idea, but
don't expect it to cure this problem.

I have no "vapour barrier" in the loft.


You don't need one.

In the year I have had cavity wall insulation done which goes right up
to the apex of the gable ends.

I should think so too! (I used to install CWI for many years and still
remember shaking like a sh!tting dog while drilling the top holes out on the
peaks when I first started)


There are no air bricks in the loft, but there is a good flow of air
through there (I can see the cobwebs quivering in the wind) I didnt
insulate into the eaves.

Hmmmm...moving cobwebs don't indicate good ventilation, they usually
indicate that the loft hatch is open and hot air is rising and moving around
the loft, you need more ventiation in there


Obviously I want to solve the problem. HOwever I am just after some
opinions as what to tackle first, some soloutions are easy (bathroom
door!) some are harder (bathroom extractor) and some I'm not convinced
will be a major benefit (I dont know anyone who put down a vapour
barrier under their insulation)

I don't think a VB would do any good, the condenstion is dripping off the
underside of the roof felt (sarking)...expect umpteen replies telling you to
spend £500 on celotex and affix it between the rafters, but not from me, I'm
going to tell you to knock a few holes in the wall and spend £10 on some
airbricks

Also does the polythene around my new insulation not act as a vapour
barrier already?


it stops the insulation getting wet from the condensation dripping from
above but that's all, the plastic is to minimise dust/fibres when laying

I'd appreciate any ideas on what I should tacklle first / how to
approach this.

the same as you would with condensation running down any cold surface like a
single glazed window, you open the window!

"Phil L" wrote in message
. uk...

I don't think a VB would do any good, the condenstion is dripping off the
underside of the roof felt (sarking)...expect umpteen replies telling you
to spend £500 on celotex and affix it between the rafters, but not from
me, I'm going to tell you to knock a few holes in the wall and spend £10
on some airbricks

A couple of soffit vents would be easier to DIY.
Just be sure its not asbestos board befor drilling.
They may already be there and just need the insulation removing from them.

Make sure your loft insulation is not pushd all the way in to the eaves


Samm

"dennis@home" wrote in message
...

"Phil L" wrote in message
. uk...

I don't think a VB would do any good, the condenstion is dripping off the
underside of the roof felt (sarking)...expect umpteen replies telling you
to spend £500 on celotex and affix it between the rafters, but not from
me, I'm going to tell you to knock a few holes in the wall and spend £10
on some airbricks

A couple of soffit vents would be easier to DIY.
Just be sure its not asbestos board befor drilling.
They may already be there and just need the insulation removing from them.