First time lean-to shed build - sealing query
Firstly, great site - I am looking to build my first shed and have gleaned a lot of useful information and guidance from here.
Secondly, my question: I am considering my first build to be a lean-to sharing a wall with the house in order to make the most of the narrow piece of land to the side of my house. How do I ensure that I will successfully seal the shed to the house and not compromise the house or shed with regards to water tightness etc. As a side note I intend to consult with my local council to fully understand any restrictions/guidelines associated with this (as has been discussed on other threads).
The shed will be a pent roof type and plan to seal the top edge against the house with overlapping flashing, my real area of unknown is the vertical joints where the walls join the house. Is it really as simple as filling the void with putty/sealant? I'm sure there is a more comprehensive method to do this and any advice would be gratefully received.
On a separate point, there will be very little space (circa 100mm) between the outer wall and the neighboring property, should I be concerned regarding a damp atmosphere in this gap? My intent is to fit guttering to this side of the roof to collect rain water running off the roof, but I imagine the air will be still a lot of the time and so may remain moist. NOTE: the wall on this side will be pre-treated with a long term coating (TBC) so will not require access to re-apply whilst I am in the property - that's the plan at least!
Sorry for the wordy post. If you need more information please ask.