Moonshine

Do you know what a typical U value of that build up would be with 50mm pir on the inside of the timber. How do you fix the pir to the timber frame? I would have thought any screws for battens will need to go all the way through the pir and create a cold bridge?

That is too dense for acoustics, use a max of around 48kg/m3, though really you don't need to go that high, a decent thickness (e.g. 50mm) of 24kg/m3 is enough

I am beginning to put together ideas for my house build (if i do it) and one thing that i want to do is put underfloor hearing in to the new build. At ground floor its likely to be a beam and block / slab, so UFH can go in a screed. However at first floor i don't know if UFH is really needed in all areas as it will be mainly carpeted (bedrooms), and i presume that you will get warmth from the nicely heated rooms below (hopefully). However there is a bathroom and en-suite which will have a hard floor and would be nice to have these heated. how would this be done on a timber floor, and best to do it wet or elec for limited areas (circa 7.5m2 total free floor area in bathroom and en-suite)

Can i throw my hat / question in the ring, as i am also thinking about exterior wall constructions for a proposed build which is going to be rendered mostly and timber clad in some areas. I have had quotes from timber framer for just a single stud exterior wall, which i don't really like the idea of, and i'm not sure i really want to be doing a full cavity block masonry wall with PIR insulation in the middle (300 - 325mm) However i have been thinking the hybrid construction of timber with a masonry exterior wall as below (out site to inside); Render / timber cladding 100mm lightweight / dense block 50mm cavity 50mm PIR boards 9mm OSB (needed?) 90-100mm timber stud filled with mineral / glass wool (e.g. Superglass 032) internal vapour control membrane 25mm battens for services void 12.5mm plasterboard. What do you think that the U-value of this would be? Also the construction could ditch the PIR insulation boards, and could have thicker insulation filled studs, in this case what do you think the U value would be and also how close could this go to the exterior blockworks. Can anyone share their thoughts on this and in general of a timber with a masonry exterior wall, and what is the typical way to do it

exception on one of the two houses proposed no work started and pre-commencement conditions not applied for discharge, i could apply for exception on one of the two proposed plots. I have highlighted this to the architect and politely stated his error and for him to get it sorted, speaking to him he is going to get in contact with the council. Hopefully the legal route is not required, and can get sorted by other means

now out of the 28 days period. Interestingly the CIL notice was issued to me, not to my architect my agent, so he never was able to check the amount. Still in the year period of the decision notice, so if that is what has to be done then it would have to be it.

My architect incorrectly put the wrong m2 area in the CIL form when it was submitted, and the CIL amount has been calculated based on this incorrect figure. How likely / easy is it for the council to review their CIL calculation based on a revised form/information of m2. The revision makes a difference of about £16k in CIL so its obviously something that i need to get sorted.

Do you know if any similar installations have gone in near you? If they have then they might have the background noise level which you need for the assessment. This is what the majority of the £1k is for to obtain this data.

PDF-Xchange viewer, it allows you to comment on the PDF (a white box) then print it off to PDF again to make it permanent. or just send it to me via PM and i can do it.

I have seen a few builds with a brick exterior wall leaf on the exterior walls, and timber internal leaf of the internal wall. Anyone able to shed any light on why it's done, as I would have thought all masonry or all timber would be more straight forward. Is it purely down to looks of the brick exterior and a planning requirement? I presume it's not done with a block exterior leaf which gets rendered?

congrats on the planning, any conditions that you have to satisfy before you can get started? however before you get started, remember to get your CIL exception confirmed before you put a spade in the ground.

I think that your best bet is still to put a fence up like the attached, in the location shown in one of my previous posts. This uses 34mm T&G boards, though as below a 28mm board is £6.52 inc vat per 3m (not delivered) https://www.tuin.co.uk/Tongue-and-Groove-28mm-Timber.html Assume you need a 4m x 3.5m high fence, that is ~40 boards @ £260, add in the delivery, fence posts/misc timber, concrete you could probably probably do it for £500-600 in materials. Have you been able to get any .wav file recordings of the fan in operation and in the house that the issue is occurring? Jakoustic Fencing System 3500mm.pdf

Riga Trans Birch plywood overlaid with phenol. https://www.finieris.com/en/products/plywood/plywood-with-textured-overlay/riga-trans

they don't need to come down until the day you submit anything, so may not need to be right away. also consider other trees on / off site as the root protection zones of these will be circles of radius 12 times the truck diameter.

1) the pre app advice you get will be dependent on the council, but I found mine 50/50 in terms of usefulness. Tbh if you really want to get a house in there I would get the trees down before any pre-app discussion with the council or application. What are the trees and how big are they? Also bear in mind any root protection zones of other on site and off site trees.

Looking at that picture it looks more like 8 fan blades, with a rpm Of 1450 that is a blade pass Freq of 193 Hz, that doesn't tally with the noise measurements. I would use a wav recorder app as that AMR file is probably doing some funky masking ala mp3, Which may not accurately represent the noise levels are.

Just thinking about these 5 peaks (also there is a possible 6th at 500Hz), and its getting into the realms of condition monitoring, / diagnostics e.g. the 500Hz, 750Hz, and 1000Hz could be related. @readiescards can you confirm the operating RPM of the machine?

The good news acoustically is that there is no massive noise in the low frequency region (<200 Hz), as the lower freq you go the harder it is to mitigate, though i don't know how the android phone captured this information, and any filter applied to it, as that roll off below 100Hz looks suspicious and there may be missing data there is it an MP3 file? if it is better analysis can be carried out from a wav file of the recording, though still limited by the frequency range of your phones microphone. The first 'peak' in noise is just over 200 Hz, and this peak is the blade pass frequency and will be related to the rpm (this should be stated on the plate on the machine) and number of blades in the fan. E.g if there are 12 fans and it runs at 1,000rpm, the blade pass frequency would be 200 Hz (close to where your first peak is). What is of note in these measurements is the blade pass frequency is not the dominant noise, and the peaks at ~480Hz, 600Hz, 750Hz, 1000Hz, and 1600Hz are circa 10 dB louder (even more so than the 200Hz tone once A-weighting is applied, if it hasn't been already), though don't follow a harmonic relationship. The character of these peaks make me think that its not the main fan blades that is the issue, and its more likely to be noise from a gear box / bearings and the like. can you up load the audio file? Whatever it is/ they are its something that is occurring at a faster rate than the main fan blades. Any photos inside the fan housing, any way of checking the condition of the bearings and excessive play? Can you do similar noise measurements in the house that the complaints are occurring, as this will show which frequencies are the ones getting to the house and any ones that dominate inside.

obs, you couldn't do second fix electric nor anything gas related in second fix plumbing.

No where near London, but also note this is probably a minimum spec as pointed out by @Russell griffiths

mine is a flat roofed house, with 2 storeys agl, with the total area of the timber frame part of 141m2, quote is ~£38k exc VAT for supply and erection of timber frame and installation of insulation (0.17W/m²)/AVCL/Service battens. This equates to about £269m2 good shout, my quote is for 140mm single studwork only. notably this does not include external render board, plaster board, staircases, roof coverings, fire socks.

i agree, but i think build costs should also include landscaping and driveways.

Is anyone able to give any details of what the cost and percent of the total build costs the total timber framing element (including thermal insulation) of their build was? I've had a quote through which is about 15% of my indicative total build budget expectations. This for two storeys AGL, and does not include a basement element of the construction, nor the roofing. tbh i was expecting the timber framing to be more.

source: XKCD https://xkcd.com/927/

FYI Jackson are only one supplier, all you really need is suitably dense/thick (e.g. 30-35mm) tongue and grove boards that are treated for external use.