Gus Potter

How does this happen?

I do like your idea of foam glass. I've designed using this and in the right application it's fantastic stuff. How ever.. I'm very sceptical about how folk get different work packages and don't coordinate the design. You have to get your head around this. KORE etc are not here to do complex details for you or take on extra design liability, they are there to sell their product. Here is a thing I would want to understand more about. You show the soil under the existing stone wall at an angle of about 45 degrees. If that is clay then it is going to dry out and shrink like fury. If it's gravel then you will disturb it, it may fail suddenly during the build. Also you are reducing the "confining, call that a confining pressure" load above the level of the foundation by introducing lighter weight material. In other words, the soil around the found is to some extent stopped from squeezing upwards by the soil at the moment. But now you are reducing that load. The best advice I can give you is to take on board the concept but think about how the ground is going to behave, builders being rough and so on. There are far too many idealist thermal details on BH and few that understand the soil and how you build off that. You should discuss this with your SE, even if you have to pay them a bit more.

Indeed. There is a huge learning curve to go though, but if you persevere it's worth it at the end of the day. This is also true! Basements carry higher risk.

What you are doing is on the face of remarkably tricky! Your builder is showing positive signs by asking about this. Yes you need different types of cavity closing and the cavity ventilation details change depending on location for example; above the windows, up the sides and under the cills! It takes a lot of experience to get this these details correct and coordinated with say MBC. Unfortunately I can't read the detail as it seems to be a screen shot. The fundamental "hard thing to do" is to have a ventilated cavity, that get's closed if there is a fire. I and others may be able to help. I might even post some of my drawings that show examples / give you pointers on the key things you need to consider. But first I would want to see what and where you have got to in the detailing stage. Can you post the actual drawings you have rather than screenshots?

You make a good point about the skills you have, I accept that. The regs have become a lot more stringent particularly in relation to portal frames on or near boundaries. Best thing you can do is to give your SE a call and discuss.

Thanks for expanding on my good news story! I hope Rawlins Paints don't mind me singing their praises but attached is their painting instructions, that mentions how much you can thin the paint. They also supply the wet film gauges so you can measure your paint thickness. This is power to your elbow if self building. Yes.. heavy steel sections can be designed where they don't need fire protection. In a fire we are allowed to reduce the imposed (live loading) as the chances of the building being fully loaded up and a fire happening are smaller. Us SE's design on the probability of all load acting at the same time. If we designed for the worst case of everything happening at once then that would be.. not practicable / justifiable on a risk basis. Yes, I also have no doubt many buildings are under-protected. Build hub Rawlins Thermocoat WI, WO & S APPLICATION GUIDANCE (5) - Copy.pdf

I was generalising. I makes no difference as you should know. The condensate seal trap works the same way. It does not matter if it is internal or external to the boiler. The fact is that if water backs up in the rain water pipe it's going to piss out inside the house big time and wet all the electrics for example. . Of course it triggers a cut out of the boiler but where does the over pressure from the rain water pipe go then. If the rain water pipe backs up then the pressure head is at gutter level say that is 2.5 to 3.0m head. In the round the thing stinks. This sounds like a bit of a straw man argument. Are you serious? A Pressure relief valve into a condensate pipe? Can you explain in lay terms?

Hiya. To provide a bit of context, much of my initial SE training and Masters research was on portal frames. I know enough to make a contribution on this type of design. Here is my offer. You can call me on the phone on 0771 308 1597 for a 15 -30 min chat. It's free for BH folks! This forms part of my pro bono work that is good for my soul, my primary qualification is in Civil Engineering, you work for the public. Text me first so I know it's you. I'm pretty deaf so sometimes miss calls. I use my own name and can be easily found on the internet.. I get some interesting calls and offers, these range from "massages" to lots of "financial" offers and other "stuff" that actually breaks up my day, hence me filtering calls. The section sizes you quote might be dependent on your eaves height, wind loading and the types of finishes. That the best I can do for now.

Ok @Nickfromwales and Karen. To expand, my mum is 95. The following happend to my neighbour. The rainwater down pipe got blocked and the water backed up. The water then flooded back up the discharge pipe, over flowed the tundish inside, soaked the electrical fuse box, soaked the floors. Karen. You are right on this. If you need some help then happy to chip in with a draft text to support a complaint as I'm sure @Nickfromwales will also do.

I agree how on earth can this be justified. Now they might say well ok we are following the gas regs we have the right tun dish inside so the over pressure is discharged. Putting my SE hat on I'll say if that pipe freezes you can't have water pouring into the structure. Now the building regs support my statement. It's a disgrace. Between you and I @Nickfromwaleswe could make hay with this compliant! And to do this to a person of this age is appalling. My own view is that there needs to be a bit of punishment element to discourage others. The way you actually win this argument is to use a technique that I deploy against say the NHBC for example. You might have a valid case for saying it's a structural safety issue. Then your case will get elevated up the chain. The structural issue is that if the pipe freezes water will potentially get into the structure and cause structural damage. You might argue that it might stain your flooring..but that is subjective, but as an SE if I argue the safety case they start to maybe wake up and smell the coffee. Karen, be persistent. What is happening here is gate keeping, they deny, delay, defend.

Historic bricks vary a lot in size, but that is the attraction. If the brickwork is essentially non load bearing then your options expand a lot. But BC might ask about their frost resistance. If they are particularly permeable then they may ask for a bespoke DPC type detail. It's horribly frustrating at times as a designer , especially when trying to recycle materials and do the right thing environmentally.

Call your SE and they may fix your dilemma. Why do you think the steels are oversized? What you are doing is actually quite complex and fraught with difficulty in terms of the fire design. Your SE is best placed to help.

Here is a bit of a good news story. There are two common ways of fire protecting steels. We can box it in with steel angles and say Fire Line plaster board or we can paint with intumescent paint. But BC often ask up front for a specification on the paint system. I wrote this morning to Rawlins Paints the following: Dear technical Department. I'm seeking assistance with a paint specification for steelwork fire protection and certificate / data sheets for a building warrant submission. Attached is a drawing showing the proposed steelwork. The project is a single story domestic house extension with a pitched concrete tiled roof in Scotland. The requirements are: 1/ Level of fire protection required 30minutes ( short duration). 2/ Section sizes are 178 x 102 UB19 S275 or S355 and 152 x 89 UB16 S275. 3/ The load ratio for the 178 x 102UB 19's is 35% and the load ratio for the 152 x 89 U16 is 50% 4/ Exposure to fire: Three sides are exposed; bottom flange and sides. The top flange has a 145 x 45 timber wall plate shot fired to it to support timber rafters. 5/ The beams are orientated in the vertical plane (top flanges upper most), loaded vertically downwards about their major axis. 6/ Quantities:The steelwork lengths are shown on the drawing. 7/ Steel design code is BS5950 part 1: 2000 8/ Exposure to weather: All steelwork is within the weatherproof envelope of the building. Thus dry conditions. No chemical exposure is required. 9/ Application of paint is to be on site, ideally brush applied. This can be done before fixing of the wall plates. By the close of business today I had a paint specification and an undertaking to supply the certification certificate provided we use their product of course. That is a fantastic service! Now for folk on BH. I'm putting these steels in awkward places, thus to box them in is going to be very labour intensive and that is very costly. On a technical note in item 3. I refer to what is called the load ratio. The steel sizes on this project are sized on how much they deflect in service. That stops cracking in ceilings for example. But in a fire we just want to make sure they don't fall down. The load ratio is the load on the steels in a fire compared with the steel beam ultimate strength / buckling strength. Long steel beam design is often governed by buckling, it twists and distorts first. That is why we tie floors into the steel beams for example to prevent the twisting in normal use. But during a fire that contribution can get lost as the floor / roof can burn away to the extent that it stops restraining the beams. Thus the load ratio is based on the strength of the beam when say part of the restraining floor or roof burns away in less than the required fire protection time. But even so using a paint system can be very cost effective. If a beam is not fully loaded up to it maximum capacity during a fire then the intumescent paint system can be of real economic advantage. To explain roughly. If a steel beam is loaded up to it's maximum capacity then it will fail at a lower temperature. A beam can still carry a bit of load at a higher temperature and that is where the load ratio comes in. The paint acts like an insulating blanket that slows the rate the steel heats up.. and that gives us the fire duration requirement we see in the building regs. The above it intended to give you a bit of a template if asking about intumescent paints.

Fair comment and accepted.

This is very well stated. It's part of Scottish humour, "ma sides are bursting". That means I'm chuckling a lot having read this, enough to hurt myself. One part of the meaning is to say that profit is sanity, turnover is vanity. A corollary could be the way a Yorkshire Farmer conducts business.