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Why not use tilt firrings? Most timber merchants do them - they will give you the fall you are looking for without the need to install your posi's at an angle. Water will run no problem at a gradient shallower than 1:40. There doesn't seem to be a large span there so you could achieve this without great difficulty. Alternatively, ask the posijoist manufacturer what angle you can go to (that's if you have already had them made) - they are engineered joists and the webs are calculated according to the stresses based on their proposed installation. As such, if they are installed at an angle, they could cause stresses not factored and the webs could potentially fail. Not saying that *will* happen - but the potential worst case scenario. For the roof covering, I would recommend using Firestone Rubbercover - I have used it several times now and never had any issues with it. It is a single ply membrane and is flexible enough to accommodate expansion and contraction without compromising the integrity of the membrane. I have attached a photograph of one I did some years ago for my brother. Hope this helps.

At 220m this is in danger of becoming the longest thread... (Long way to go compared to some though! )

My experience with ecology is very similar to above. I achieved 89 without solar pv on a passive spec build and then managed 101 with 5.5kw of pv. I was aiming for 100 for a discounted rate. I knew all along though that the discounted rate would only be for a few months as it is a 2 year mortgage period and I started the clock running on that one before I even knocked my old house down.

Agree - we are Ecology customers and at application just had to show how we were planning to achieve the required standard. During the build you are on their standard rate, discounts are only applied once you can demonstrate (with EPC) that you have achieved the standard. I used the FSAP tool to model the house and generate a target EPC, Jeremy wrote some guidelines on this in his blog I believe. You can play with u values for the fabric (walls, windows) plus add PV and system details (heating, MVHR etc). Given our house was designed to near passive standards we qualified easily enough, Ecology did not dig into it at all. We actually achieved 91 on the EPC which was enough to trigger a modest rate discount. Agree that they are great to deal with, very personal service. Also, for us, we had full freedom on how to draw down the loan amount - whether the full sum from outset or chunks as we needed them. No surveys or questions asked, a simple email from us released the funds.

Hi - I believe you only need to show that you are aiming to achieve the sap rating of 85 plus (don't tell them any different though). Having said that, I would think 85 plus is quite easily achieved. If you do need extra points - I think Pv gets you quite a few points so just show some on the plans. On a side not, it looks like ecology have lowered their sap lending criteria - would recommend them if anyone is looking for a mortgage.

That is a loaded question! What is your current SAP assessment, House construction methodology, Insulation, air tightness, ventilation, heating system, hot water system, renewable...... We need more data to be able to give any advice. Generally, well insulated, reasonably air tight shell will have the most impact, plus if you have mains gas that helps (very counter intuitive). Renewable's also add to the score (ie lots of PV).