No eaves - how can I add ventilation

[chuckalicious]

I have an old house which has a slated roof. The front of the house has eaves, the rear doesn't.

In August 08 I had the rear elevation felted and reslated, which, effectively will have cut the ventillation down quite a bit. The slates were well past it, but I couldn't afford to get front and back done.

The rear elevation, which has no eaves, is cut off from the top of the loft by an age old loft conversion (nothing to do with me), which gets ventilation from the eaves at the front and so isn't getting much of an airing.

Although there are no issues yet, I would like to know what options I have if I do indeed find I start getting condensation.

Thanks

 

[chappers]

slate vents fitted high and low level.

 

[chuckalicious]

Thanks for the reply

Is it possible to fit these without too much disturbance to the surrounding slates?

I'm guessing I don't need the ventilation as the roofing company I used are well known as good at their craft in my area and they didn't feel the need for the vents, but I like to know my options if the need arises.

 

[tedpowell]

do not rely on a roofers reputation, it is usually judged by customers who are who are unaware of the need for ventilation and are pobably wondering why the goods they stuff into the roof space are damp, and probably havent noticed the subsequent bulging of the ceiling caused gy the extra weight on the joists. the crude rule of thumb is 2 low level to the front elevation and the same to the rear, then ditto at high level because on a wind free day the condensation bearing air will rise to the ridge inside the roof and pond.
i have known a housing association call in a specialist company to solve the problem of excessive condensation in a roof space, doesnt say a lot about there surveyors, the specialist inserted all sorts of cast off rainwater pipes as a channel fron the eaves into the roof space to introduce more air. big mistake, the roof was damp because over ventilation and they made the problem twice as bad.