Great_scot_selfbuild

This was what I was originally thinking but our builder suggested having an air gap under the breather membrane. I'm now thinking this wasn't needed; the reason for the battens was the same as running vertical cladding - to provide airflow up and down the roof. Given that the corrugation does allow for any condensation to run out the bottom (to a degree at least, as some will go to the lower edge of the curve, and then onto the purlin). I don't want to do any re-work to remove and re-install the membrane as this will take days and cost a lot of labour, so I'm thinking we just put a strip of membrane over the purlin to prevent it rotting and rely on the airflow such that there won't be that much condensation anyway (wishful?) (As much as I'd love to do more of this build myself, and I'm sure I'd enjoy it, I just don't have the time and it would be a 'forever build', rather than a 'forever home'...)

Photo I meant to attach (thanks @JohnMo)

@flanagaj Our planning condition submissions were also published on the council site, though this is inconsistent as they haven't always uploaded the condition documents. External Finishes_Planning Condition_Buildhub example.docxI've attached the document I wrote to submit my examples of external surfaces.

We’ve had our garage roof built and we’re just about to put the corrugated sheets on, but I've been thinking about the roofing and breather membrane and I'm concerned it's not in the right location. I hope I'm missing something and the group here can correct me and allay my concerns! (numbers relate to the attached photo). We have a ridge beam, rafters, OSB on the rafters (so we can add insulation internally later), and then battens followed by horizontal purlins. The photo that I’ve annotated matches many images I’ve seen of roofing being installed on horizontal battens and then breather membrane, but I’m concerned that if the roof condensates then the water won’t run out (yet this is the same with other roof images I’ve seen). The battens (A) are there for airflow (1) below the corrugated sheeting and (I thought) to allow the condensation drips to escape, but being below the breather membrane (2) this means that the water will drip onto the membrane and collect (3) against each horizontal purlin (B). Or is the fact that we have horizontal airflow directly under the corrugated sheet, and an air gap under the breather membrane enough to negate the issue of condensation? (We aren’t installing shaped foam at the ends of the corrugated sheets), to allow airflow and condensation to run down the sheet. Anyone with knowledge/experience of this?

@LiamJones yes - exactly that (all points)

@Oz07 thanks - I'll be sure to ask.

@JohnMo I too found that - unfortunately it didn't really help.

@garrymartin I must be being blind - I had read that, went to my profile and simply can't find anything that suggests 'create a blog'. I thought it would be under '+Create', but as you can see - I have no option there. Can you advise where it is please?

Title says it all really. I really was expecting the 'Blogs' page to have something about 'start a blog' or perhaps some guidance on what makes a good blog / tips etc.

I'd just like to see a list of blog titles, rather than the latest posts that happen to have been published. I'm not searching for anything in particular - just want to scan the blog types to see which ones I want to dip into.

Is there a way I can view a list of the blogs, rather than just see the latest entries (which then needs me to select one and then again to click the blog title above the entry to see the list of entries associated with that blog)? Additionally, can I view them as a list, so I can scan the titles quicker rather than the huge 'thumbnails' and having to slowly scroll through the pages? I really must find some time to publish some of our own journey on here, but I want to structure it in a way that is more useful to look back on. Thanks

@Oz07 can you please explain '+compo'? 20250527-Floor_Build-up_Layers_Client questions.pdfThe beam ends will be sat on a steel ring beam (with at least a 150mm air gap beneath), do I need DPC to be underneath the B&B (please see attached image that I sent to our architect. I was getting frustrated at the ambiguity of the dimensions being discussed, hence the sketch - could you please comment on the dashed lines and my question on the image?

@ETC Thanks - I've picked up on this and have submitted for some quotes, partly to see if different layout configurations come back, or if they all approach it the same way (which is what I hope)

We’re due to have a steel ring beam installed on screw piles (this is a separate challenge - one for another thread probably), and then a timber frame house (Larsen Truss) on top; the footprint of the house is c.135sqm and I’ve been quoted the following: Materials for B&B floor: £3.7k Labour to install the ring beam and B&B floor: £12-15k (tbf the ring beam is complicated - it does feel excessive, but I’m rather stuck as I’m not a structural engineer and I need it to be able to meet the warranty requirements). From what I’ve seen on this forum and various insta accounts of self-builders, the laying of B&B floor looks quite easy but jut a lot of manual labour. Should I be expecting our principal designer to design the B&B layout configuration, or our structural engineer? (I’ve seen combinations of blocks laid in each orientation, but it’s so far not been included in the SE drawings). Grateful for views from those who have done it and any advice. Thanks in advance.

@marmic interested in your build - sounds like we’re working around very similar challenges. We’re doing a suspended steel ring beam with b&b and then a timber frame (Larsen Truss) on top.