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Good, found a local steel man. 127x76mm steel beam cheap enough :) Now the blocks are soft type so will need padstones or steel plates Which is best for my situation? Pros and cons of each? Padstones seem to start at 100mm wide, I assume I can just cut them down?

75mm steel box lintel hard to find , maybe special order

in the backof my mind somewhere there is a limit to the length of concrete?

it will be supporting 2mx3m thermolite type blocks , which are 3" thick and half inch sand cement plaster on both sides, no other loads. the lintel will be 2m long and of course needs to be only 75mm wide. I thought a catnic or such box lintel would be ample

Going by what you have said i think the purlin is ok. You said your having new felt and battens, but not new tiles? Check what you put on the roof is not heavier

9" timberlocks

Maybe the sheets were not stored correctly (the mould already on them)? I think he might be right , treat it and it will go. The sheets may not completely dry out until a prolonged dry spell.

Hi desig, this might not help and probably too late but, is it possible to raise the pitch of the roof? This will eliminate your immediate problem and make sure you don't have future ones!

Malc, some tiles are double lapped (little ones, plain tiles) these have soakers. Some tiles are single lapped (big ones like yours) these have cover flashings. There is a type of single lap tile (big ones) that have a completely flat profile these have secret gutters. Your solution to the...

Its one of those thing...... the tiles wll either break or they wont? Get a few 49s spare an go for it

Very good pics by the way

not sure i have ever seen such an over complicated design. think i might be able to see a can of worms opening up I would Secure the copings and cover them.

?.... got to be easier installing a secret gutter, its the proper way, sounds to me like it would use less lead and no lead on the tiles on show. (can even get it in plastic lengths heaven forbid)

Did you use an architect? If you did give him a punch! I have refused to tile roofs like this because it will always become a problem. Why do architects keep drawing roofs too flat? Tile manufacturers dont help with their headline grabbing 'low pitch tile' (which turns out can only be laid on a...

Can you stick it down?

They are interlocking tiles aren't they, dont have soakers with inters! Should be a secret gutter, but i bet it hasnt

Yes you want the outside vent lower.

Slate. Depends on the building of course but if it suits, slate is my preferred

The 'bracings' are to stop spread, not to stop bowing Be sure the bottoms of the rafters cant spread then

Yes please, lets move on. Got to be the longest most boring thread ever. I think a loft is warmer with felt, other people don't. That's all good lets agree to differ I will end on a laugh (well you got to otherwise you cry) When your dead, your dead, you don't know your dead because your dead...