Insulating Eaves of a loft conversion - Have I messed up?

Shock

Hi guys,
Have an existing loft conversion that has an uninsulated eves in one side for storage with a small hatch on the purlin wall for access.

The Purlin wall is insulated, but the small door seem to let in cold air.

I want to use the eves for storage, but its not insulated and gets very dusty as this side of the roof is facing the road.

here is a picture as I would describe it.(ignore the bad drawing)
 

So, over the weekend, in my wisdom I decided to insulate the underside of the roof timber with foil insulation, and I think I have stopped most of the draft and dirt coming in. In my head there is still plenty of ventilation above the foil to keep the timber healthy? Have I thought this right?

Here is where I have added a foil .
 

here is a picture of my foil work.
 

Have I thought this right? Its nor perfect, I just wanted draft & dust to stop, it probably isn't fully wind-proof, but thats ok.

Is this going to cause issues of condensation in the roof rafters? Have I messed up?

I could have used PIR insulation between the rafters, but the hatch door is small and would have made the job very difficult. I mainly want the wind and dust to stop and am aware that the foil won't stop the cold coming in.

But now I am concerned that its going to cause condensation.
Or am I over thinking this? as there is over 100mm ventilation above the foil and the roof tiles?

Brie

Interesting - we have the same problem and I've been mulling this over for 5 years.  No answers unfortunately but condensation was my first concern.

Netexporter

It seems like the rafters are getting sufficient ventilation but I also think there may be a potential condensation risk in the storage space. I'd put a hygrometer/thermometer in the space (you can get bluetooth/wi-fi units quite cheaply) and monitor the relative humidity, particularly in cooler weather. If the RH remains largely under 60% your stored items should be safe.

bucker

Hi - I'm a professional carpenter/joiner. Have you got vents fitted to the outside of the roof ? They would normally be fitted to the bottom and top of the roof to allow air to circulate the timbers. A minimum 50mm air gap is allowed between insulation and inside of roof according to building standards regs, as you have 100mm and plenty air coming through the roof anyway, I doubt you would have a condensation problem.

Shock

bucker said:

Hi - I'm a professional carpenter/joiner. Have you got vents fitted to the outside of the roof ? They would normally be fitted to the bottom and top of the roof to allow air to circulate the timbers. A minimum 50mm air gap is allowed between insulation and inside of roof according to building standards regs, as you have 100mm and plenty air coming through the roof anyway, I doubt you would have a condensation problem.

Thanks for the replay.

On the slope roof side I can't see vents, but they were getting a lot of air as before the foil went in the roof felt under the drafters were constantly moving up and down from the wind.

On the new flat roof side, there are vents fitted but thats the other side of the roof.

Shock

This is how I hope the ventilation will be like