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MikeSharp01 last won the day on April 29 2017

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About MikeSharp01

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  1. So that upright by the green box is very probably, 99.9%, structural as is the one further to the right by the looks of it as they are supporting the Purlin. What is below the green box on the ground floor?
  2. More snow?

    Not much here, just a centimetre or so, enough to stop work on site today so I will be doing admin, and sums on our fire ratings, I have found the accepted eurocode component additive method and all I need to do is plug the various elements into the equations and get an answer which I will then share with BCO.
  3. Yours truely is very annoyed.

    Hey I found this which sets out the euro codes (must still apply one guesses) and this uses the additive method, page 108 ish, Maybe the maths is out there. https://www.google.co.uk/url?sa=t&source=web&rct=j&url=http://eurocodes.jrc.ec.europa.eu/d oc/2012_11_WS_fire/presentations/08-FRANGI-EC-FireDesign-WS.pdf&ved=2ahUKEwipkMqb5vPZAhXMCsAKHcZZDZIQFjABegQICRAB&usg=AOvVaw0bpNVlmIHXRbz0b4H8haOV
  4. Yours truely is very annoyed.

    Yes I saw that but decided that a horozontal fire boundary was having to work harder than a vertical one given the thermodynamics of fire. The l- joist wall is a pretty standard thing so there must be info out there I just need to find it. Or create a test panel and get it tested (not). If there are no mathematical models one wonders how we got this far without them.
  5. Might be able to take half out by doubling up those that are left.
  6. Yours truely is very annoyed.

    Here is my first response on the MVHR - part F stuff, I have tidied up the spreadsheet I used for my initial spec design to include all I can see as relevant from part F. Any comments greatly appreciated - I hope I have not tied myself down too much? SSP090 - Systems calculations.pdf
  7. Yours truely is very annoyed.

    OK people and thanks all ( @ADLIan@Mr Punter@PeterW@Temp@Ferdinand ) I may have found the answer to the fire resistance in the Finn joist literature. It says for 60 minutes, Horizontal plane (As in an internal floor) you need (bottom up) 2 x 12.5mm of fireline board then the joists (insulation is optional so takes no part in the first resistance) then 18mm OSB on the outside, we have a vertical wall, 15mm OSB covered in 40mm of PUR then the gap then the cladding. So we have lost just 3mm of OSB but gained a whole lot more on the way in and out including what should be increased fire insulation both ways because of the PUR. So I am hopeful that this will convince them. (I do not want to go to 18mm OSB as it is so heavy.) Looking at the british Gypsum White book it says 2x12.5mm Fireline as well. So I guess I just need to adjust the drawings to show fireline 12.5 x 2.
  8. Yours truely is very annoyed.

    Thanks, that is is an interesting perspective and maybe what they are driving at. I will see what finnjoist have to say! @PeterW we are not skimming the PB, dry lined so I guess it will all be down to thicknesses of Fireproof PB.
  9. It looks that way but you need to get an SE to look at your plans, there may well be something we have missed.
  10. Yours truely is very annoyed.

    Thanks @Temp I will take your advice and increase the detail. Most of which I have anyway in the PHPP for the flowrates etc. The fire resistance is a bit tougher as I cannot find any mathematical models for our wall construction. The outer surface is class 0 so gives 1 hour I believe then there is an air gap then 40mm of PUR then 15mm of OSB then 300mm of glass wool insulation in between I joist uprights then the air tight membrane then a service void then 12.5mm of plasterboard. So going out to in is at least 1 hour unless radiated heat from the inside of the cladding ignites the PUR. Going in to out think the PB only gives 15 minutes but to get to the outside you have a long way to go before you hit the backs of the class 0 cladding which is a further hour but by then the structure is all gone. I need to do a lot more reading or just put two layers of firestop PB on the inside which gives me 45 minutes, before you get into the structure, I think but is so much more expensive.
  11. Ah so looks like the roof is supported by the ridge beam and the purlins each of which are supported on structural walls at the ends so the loads on the sidewalls are low and spread is not likely to be an issue. If the rafters run to those structural walls then that explains the issue with the rafter runs. Those walls are key to the structure so treat with care. Get structural engineer to check it all over once you have a plan and before you impliment it.
  12. Sounds a bit odd. You need to know how the roof is braced have you any pictures of the internal structure. (Cross posted with Peterw)
  13. Yours truely is very annoyed.

    Thanks all. I am in the process of highlighting the answers and will.send him just the answers but referrng to where in the main portfolio it came from.
  14. Hello and yes, it's a renovation blog.

    Yes but imagine the property price slump that would ensue.
  15. After 4-5 weeks of cajoling our BC provider has final got back to us, for the second time with many of the same issues from the first time, despite me pointing out that they had all the answers, bar one on day 1. One is wondering if they read the stuff you send them. Here is what our BC wrote. "I have check through this package of drawings, and we still seem to be missing the following details. 1. Please provide details of the fire resistance to external walls within 1.0m of the boundary. This should be in terms of its minutes of fire resistance from inside and outside. 2. Please provide design specification for the proposed MVHR ventilation system. We have a layout but need the design details. 3. Please confirm the provision of network access to the new dwellings. 4. Please provide design details for the proposed staircase, and guarding to low level glazing. 5. As an extra item I picked up, please can you confirm that Bedroom 3 will have an escape window as it is an inner room." Here are the portions of our documentation that applies, and I admit that I assumed that when you gave BC a fire rated class EG AA they could work out that it is 1 hour, and that is just the outer cladding. 1. The architects drawings, see above, refer to details under these headings as do the structural drawings and calculations in terms of charring. External walls within 1000mm of a boundary. The external walls are clad with fire cement tiles in line with the architects specification the tile specification will be as Marley Thrutone and these are rated CLASS 0 as is required within 1000mm of a boundary. Details can be found in the properties and performance page of THIS (hyper link) document from Marley. 2. To comply with BR Part F1 Section 5 A whole house MVHR system will be installed to provide ventilation in excess of the minimum required. Flow rates will be verified during commissioning of the MVHR system. Details of pipe runs and locations of Plenums are shown on the architect’s drawings but may alter slightly as the build progresses alongside the development of MVHR technology in the wider sphere. All the Extracts from WC, Bath rooms and Kitchen area will be sized to exceed the requirements of Part F Section 5 – Table 5.1a and whole dwelling ventilation Part F Section 5 – Table 5.1b against the 3 bedroom dwelling criteria. The Kitchen Cooker hood will be a carbon filtered recalculating unit. In addition to the MVHR system and to support summer cooling a passive stack circulation system has been designed into the build using the electrically controlled high level opening roof lights. - AND IN THE SAP CALCULATIONS SECTION - (Full MVHR System – unit TBA, but probably the Airflow Adroit DV145 but Efficiency of at least 90%) 3. The building is connected to the main telephone and ADSL network via the utilities building, adjacent to the telegraph / power pole in the front garden, and is then ducted into the main house from the utilities building. 4. A final design for the stair case is not yet complete but it will be so designed as to meet the requirements of BR Part K. (I admit I did not specify guarding of low level glazing but the architects specification refers to toughened glass everywhere.) 5. Means of Escape: All habitable stairs connect directly to the main entrance area and external doorway. Both first floor bedrooms will have clear openings that meet the acceptable dimensions in BR Part B section 2.8. The ground floor bedroom (Bedroom 3) will also have a clear opening that meets the acceptable dimensions in BR Part B section 2.8. What have I got wrong? I could tighten up 1 and work out the delay times both ways and that I will do. Do they want air flows, volumes etc for all the rooms and spaces in 2. Not sure I can be clearer in 3 (The drawings do show the duct). 4. Seems acceptable to me but maybe I have to complete the design before they will sign off the plans. 5. I don't think I could be clearer. Calm me down someone or tell me I am wrong, in which case I will open my second beer and do it all again.