Condensation in my loft

CMG_2

I have the same problem

level_up

condensation issues are caused by water vapours created from a warm enviroment making contact with a cold surface, ie- a warm house - cold roof tiles, warm room - cold windows, i went into the back of my van yesterday to get out some tools and the inside of my roof was dripping with water due to me having my heater on in the front of the van,
there are ways to control and slow the process but in my opinion you cannot stop it completely well that is if you want a warm living space, if you were to keep the house the same temperature inside as it is outside no condensation would occur but clearly we dont want to live like this we all like comfort and warmth, so the best we can do is to try and control the situation, ALL of the suggestions in these threads are fully valid and would all help to a degree!! the varying factors are how much heat is in the house how sealed the house is to the loft and how much ventalation and airflow is there in the roof,
having insulation in cavities, lofts and everywhere and anywhere else is clearly going to have a big impact in this issue as the building is warmer and for longer thus creating more condensation, so to remedy and emphasise, seal the house from the loft ie loft hatchs holes from pipes etc etc, keep loft insulation a sensible distance away from eaves to allow good air flow, add extra vents the more ventalation the more airflow the more airflow the less condensation this is also important in the storage of itemns in your loftspace as the more you put up there the less airflow there will be, altenatively keep your heaters off and put on an extra layer of clothing sorry but in and only in my opinion thats the way it is, just remember it is only like this for a couple of months of the year so spending thousands to assume you will rectify completely will inevetably end in upset customers and wholes in pockets

C_Mababejive

Having noticed this thread,i checked my roofspace and i have signs of condensation too though only comparatively low level. Again one side seemed worse than the other.

The house is about 30 years old and the roof construction is soffitless. That is to say the A frame trusses rest directly on the tops of the walls and there is no apparent ventilation/openings at gutter level. In the loft,the wall tops can be seen and they have closing boards on them to seal off the tops of the cavities.

I took advantage of the Npower insulation offer in the summer and topped up the insulation. Unfortunately i pushed the insulation too far into the eaves.

I have now been back up there and eased the insulation back from the eaves so that it isnt in contact with the felt and is clear of the tops of the wall cavity closers.

I also have an aluminium twin wall flue pipe which passes vertically through the loft from a conventional flued central heating boiler below to a ridge terminal.

Presumably the bit of heat radiated from the flue pipe in the loft will assist is warming the loft a little?

I also slipped some sort lengths of 22mm diameter plastic tubing under the felt at intervals just to open up a few gaps.

I shall monitor the situation !

snoopy2008

Hi SideFX,

I also had this problem quite bad in my loft
I searched the net and found a site for this product called lapvent which sounded to good to be true at first, but I thought I had nothing to lose by trying it out, so I bought 2 pairs and within a couple of days my condensation had completely gone! It really was a miracle cure so I completely recommend it to anyone who has the same problem in their loft.

snoopy2008

Lapvents saved my loft!

Broomhead

Hi, I've also had problems with condensation in the attic. I moved the insulation away from the eaves and whilst it's cut it down a bit, there's still a significant amount forming.

I spoke to a couple of roofers (one suggested moving the insulation) and one suggested having polyurethane foam sprayed on the inside of the roof. Has anyone tried this and did it solve the condensation problem?

C_Mababejive

Broomhead wrote: »

Hi, I've also had problems with condensation in the attic. I moved the insulation away from the eaves and whilst it's cut it down a bit, there's still a significant amount forming.

I spoke to a couple of roofers (one suggested moving the insulation) and one suggested having polyurethane foam sprayed on the inside of the roof. Has anyone tried this and did it solve the condensation problem?

I doubt that Poly foam spraying would have any effect other than making a mess and lightening your wallet.

There are only two solutions...

1) Remove some insulation so that the temperature differential between warm house and cold loft is les

2) Provide effective ventilation so that water vapour which is approaching its dew point can be vented to outside

A combination of both depending on circs

C_Mababejive

snoopy2008 wrote: »

Hi SideFX,

I also had this problem quite bad in my loft
I searched the net and found a site for this product called lapvent which sounded to good to be true at first, but I thought I had nothing to lose by trying it out, so I bought 2 pairs and within a couple of days my condensation had completely gone! It really was a miracle cure so I completely recommend it to anyone who has the same problem in their loft.

Hmmm....so your in Bath and Lapvent HQ is in Salisbury,not far away.

dansage

hi all,

i regulary use my loft as a music studio, and had floor boards fitted a couple of years ago. i have never had a condensation problem until this week. 2 weeks ago i started to fit insulation boards across the rafters (to give the 50mm gap) and have fitted them from the top/middle beam to about half way down at the minute. yesterday i noticed that condensation has been forming behind these boards, and running down the inside of them onto the floor, yet the felt i havent yet covered is dry. will this stop once ive completed the insulation? or is the problem that the air coming in from the soffit vents cant go anywhere? IE it can go up between the felt and the boards, but not across the other side because of the boards going all the way to the top?
thanks

neutron

SIRT wrote: »

This is a really interesting reply and one which I hope I might be able to help with. Can you tell me what type of roof covering you have? ie type of tiles? Also have you spoken with lapvent as I have fitted many of their products and know they work extremely well.

Roof covering - Redland Regent M tiles/roof felt.
Before purchasing LapVents I submitted a plan of the roof to LapVent for assessment and had lengthy discussion with them about the positioning of the units. The recommended eight LapVents, costing over £300, were fitted in the recommended locations and they have made absolutely no difference, the North facing side of the roof has been dripping condensation just as it has in previous years. I'm very surprised to see other posts here reporting satisfaction with LapVent, they have not resolved my problem.