Pitched roof without any felt, should I worry?

[Spencerd]

I am in the process of buying a semi detached house built in 1929, it has a slate roof that is in very good condition and does not leak.

The loft space has a very thin (2-3cm?) layer of insulation underneath the loft floor boards which cover about 50% of the loft space.

I'm assuming that when I move in I will be paying a large percentage of my heating bill to warm the feet of the birds that land on my roof?

I was going to increase the floor insulation to 100mm depth on the entire loft area. What I was not sure about was what to do with the roof.

I assume that my options are:-
1) Fit roofing felt under the slates, I assume that this would be a job for a roofing pro?
2) Fit something internally to the loft space, attached to the rafters? No idea what though!
3) Take up bird spotting and specialise in that niche of birds that like their feet to be warm

Also, if I remove the ventilation in the loft by blocking this natural ventilation, I guess I need some other ventilation such as an air brick or two?


Spencer

 

[Nige F]

Leave the slates.......Insulate the ceiling.........look for a grant@ you r local council Stop "twitching" most are vermin

 

[Spencerd]

Thanks for your help