HELP raining in my loft

[DAVIDL]

can anyone give me some advise on my problem?went in my loft today and water was dripping from the roof,it was frost thawing out or condensation all on the inside of the roof.never had this before.roof is15ml m.d.f. board (very smooth) unpainted with a 2inch gap along the front and back of the loft. totally dry inside when raining.

[Guest j.bamling]

the mdf must be absorbing the water up but when it has froze & thawing out it must be dripping ? have you not got anything covering the mdf ?

[DAVIDL]

on the outside is green mineral felt,the m.d.f is on 2x2 wood frame,sloping front to back.walls all dry,but are t&g.

[Guest]

can anyone give me some advise on my problem?went in my loft today and water was dripping from the roof,it was frost thawing out or condensation all on the inside of the roof.never had this before.roof is15ml m.d.f. board (very smooth) unpainted with a 2inch gap along the front and back of the loft. totally dry inside when raining.

 

mdf is like(when in contact to water )giving the key to a cat of a birds cage.

ive been in the building trade for many years and would never dream of using mdf.

unless ud creosoted it 1st,but that would be covered from the wet.

when mdf gets wet its the end of it.

at this time of year there will be lots of leaks in many cots and lots of money paying out for new repairs.

tip here for the future ...prepare ur cots for the winter months at the end of the season, and keep ur money in ur pocket!

[DAVIDL]

only guessing m.d.f but its very dense and smooth.running down inside of roof.any idea why its collecting on inside of roof,any thing can do to stop it?

[Guest j.bamling]

 

mdf is like(when in contact to water )giving the key to a cat of a birds cage.

ive been in the building trade for many years and would never dream of using mdf.

unless ud creosoted it 1st,but that would be covered from the wet.

when mdf gets wet its the end of it.

at this time of year there will be lots of leaks in many cots and lots of money paying out for new repairs.

tip here for the future ...prepare ur cots for the winter months at the end of the season, and keep ur money in ur pocket!

 

Well said !!! I am the same all my repairs & alterations are done in september It is the wrong time of the year to start knocking now !!

[Guest shadow]

condensation on the inside of the roof can be caused by lack of ventilation no airflow material to thin for a roof and is getting very cold you need to insulate it for the winter then when the weather warms think about changing the roof for different material, personally I dislike mdf as if it get's damp it falls apart

[Guest]

I think it may be condensation, the air rising inside the loft is warmer than the colder roof surface and water vapour condenses out?  

 

The only similar experience I had was condensation on the underside of an up-and-over metal garage door which forms part of the roof of my aviary, and it dripped onto the concrete floor creating damp patches. I solved it by painting the door.

[phillips]

try painting the mdf boarding with pva glue 50%pva glue 50%water mix it and brush it on it acts as a sealer this will get you yrs out of your mdf

[rembrant2coo]

david l  ihave p.m. you

[DAVIDL]

thanks for your advice everyone,i agree hot air rising cold air outside forms condensation,but thing i cannot understand is there are no birds in the loft so no warm air?sent p.m.harry,thanks.

[Back garden fancier]

Weather has caused your problem, I'ts been freezing for ages then warmed up. My garage is dripping, and even the outside of the house walls are running with condensation.

[DOVEScot]

THERE HAS TO BE SOMETHING CAUSING THE WARM DAMP AIR IN THE LOFT TO CONDENSE ON THE COLD ROOF

PIGEONS, BUT YOU SAY THEY ARE NOT IN??

YOU WORKING SWEATING/BREATHING IN THE LOFT

DAMPNESS FROM WALLS OR FLOOR HEATING UP DURING THE DAY AND COOLING AT NIGHT

TO GET RID OF IT YOU HAVE TO GET RID OF THE CAUSE

TO HELP YOU HAVE TO INSULATE THE ROOF OR IN THE CASE WITH TOP AIR FLOW LOFTS BETTER VENTS

DO DO HAVE DRIP STRIPS ALONG THE HIGH POINT OF YOUR ROOF TO STOP EXTERNAL WATER COMING IN

MAYBE IF YOU POSTED SOME PICKS OF YOU LOFT, PARTICULARILY THE PROBLEM AREA, WE MIGHT BE ABLE TO GET A CLEARER PICTURE AND OOFER BETTER ADVICE :-/

[THE FIFER]

give it a good coat of masonry paint, also you can give the outside the same and sprinkle sand on it before it dries,

[Guest]

I take your point about no pigeons and hot air rising, but I think its simply down to the temperature inside the building is likely to be different from the outside temperature, and in winter, its likely to be a bit warmer inside than out [shelter from wind, walls insulation effects etc.].

 

Any water content in the air will condense out on a cold surface, and if it is condensation on the underside of the roof then the roof can't be insulated to the same extent as the walls.

 

That temperature difference is also relative - this morning the internal temp of my loft was minus2C and the external door padlock was frozen, but not the drinkers inside. I was more than surprised to learn the outside temp was -7C.  So it was 5 degrees warmer inside than outside, and if I had your problem I would have had frozen condensation on the inside of the roof, just as on the padlock outside.    

[DOVEScot]

I take your point about no pigeons and hot air rising, but I think its simply down to the temperature inside the building is likely to be different from the outside temperature, and in winter, its likely to be a bit warmer inside than out [shelter from wind, walls insulation effects etc.].

 

Any water content in the air will condense out on a cold surface, and if it is condensation on the underside of the roof then the roof can't be insulated to the same extent as the walls.

 

That temperature difference is also relative - this morning the internal temp of my loft was minus2C and the external door padlock was frozen, but not the drinkers inside. I was more than surprised to learn the outside temp was -7C.  So it was 5 degrees warmer inside than outside, and if I had your problem I would have had frozen condensation on the inside of the roof, just as on the padlock outside.    

 

:D :D

[Guest shadow]

cover the outside with currugated plastic sheet this may help trap more warm air and create better insulation

[just ask me]

just a quick fix to get u out of trouble put up that white airboard under roof should fix problem for now but futher repairs needed down the road

[stevebelbin]

The building regulations state for a flat roof to work, you need to in general have your ceiling level then say 50mm of insulation then a 50mm void then your roof covering of say plywood then your waterproofing layer. the 50mm void needs to be vented at the front and back.

[Guest Paulo]

The building regulations state for a flat roof to work, you need to in general have your ceiling level then say 50mm of insulation then a 50mm void then your roof covering of say plywood then your waterproofing layer. the 50mm void needs to be vented at the front and back.

 

Go on CAD MONKEY!!!!!!!!!!!!!!!

 

Don't forget the vapour check

[DAVIDL]

thanks everyone for all your input and suggestions you have given me, ill give some of them a try and let you know if they have made it any better.i think it will be my first job after winter to put a complete new roof on,(if it lasts that long)thanks.