Assuming you have enough soffit vents and large enough exit at top, you should pull away any insulation that is covering soffitt vents, install barriers to keep insulation off of them . And remove any loose material that prevents flow of air directly against underside of roof all the way to exit.
Three questions; 1. Where is exit for warm air? 2. You don't have any kind of "Radiant Barrier" directly applied to under side of roof or to rafters? painted on or foil type? 3. Is there a horizontal plate between more vertical rafters and flatter ones; or horizontal blocking there? 3a. Is the curling more prominent on vertical section of roof or flatter? (3A occurred to me several sentences down. Possibly more to come when/if.) you reply
Ideally you should have a properly sized entrance for every rafter bay with properly sized exits as high as they can be. Mansard roofs often have one or more cupolas, they're not there for decoration. They do provide roosting places for insect eating bats, swallows, and swifts but that's not the original purpose either.
I dunno where you are Mr or Ms mayhem ( How about adding location to profile? Would be helpful since roof ventilation also depends on winter temps and humidity.) but here I have front door in alcove facing west, Spring and Autumn not so bad, Summer and Winter, after leaves fall I cook roasts in there.
And what was your name in the States? I mean when you have non-roof related question? Though personally i like the name, images of French slaters and les enfants ripping roof off Bastille. Vive le fresh aire!
[CENTER][FONT=Comic Sans MS]Measure twice, cut once.[/FONT][/CENTER]
[CENTER][FONT=Comic Sans MS]Look at the nail, not the hammer. Watch the fence, not the blade.[/FONT][/CENTER]
[CENTER][FONT=Comic Sans MS]If you hook your thumb over your belt you won't hit it with the hammer or leave it layin on the saw table.[/FONT][/CENTER]
Last edited by notmrjohn; 10-16-2012 at 03:50 PM.