about2build
Registered User
- Messages
- 27
I think you confuse air-tightness with adequate ventilation here and also the structure/ material breathability which is different again AND inflitration losses are very different to opening doors!I'm not convinced about "airtight" builds at all.
I am aware of what the Green Minister brought it, but I don't think he was well-briefed.
Ireland has a much milder, damper climate than Europe and increasingly cold winter temperatures.
I think that the obsession with sealing is going to impede the "breathability" of the construction and this will lead to problems with interstitial condensation.
Quite apart from the fact thar, whatever about a form of construction, you cannot "seal" a house with kids and that undermines the preposition of sealing in the first place - the prevention of infiltration losses.
could you post this data please, thanksWhen you tot up the extra over cost for the initial build and do a calculation putting that amount on deposit for the period over which the capital investment should be depreciated, do you save any money? A recent thread on solar tubes suggested not.
often times the carbon footprint/ Embodied energy increases for the actual build, but the energy savings and hence carbon footprint during the buildings lifespan is much less and more than compensates..More importantly, when you tot up the extra fabrication costs of these high tech components, is there a huge overall reduction in carbon footprint. Possibly, but possibly you would get nearly as much without the additional services if passive systems were used.
yes 'wellness' is most important here as is occupant comfort but you confuse required ventilation with uncontrolled air-infiltration otherwisde known as drafts!Finally there is the unquantifiable issue of wellness, which depends in large part on air quality. We are told that "vents in the walls" will somehow know when the air quality has deteriorated to such a degree more sir changes are required. Does this not go against the principle of a sealed house?
i dont understand your questionHow does this air get in without freezing the place?
The issue you raise regarding the feed back loop is interesting. there was a post occupancy stage (in I believe) the pre 80's RIBA which was removed probably due cleints not wanting to pay for it. But it is definitely something that should be revisited. there is also the issue that architects and clients not wanting their 'sick buildings' known as a sick buildings and so maybe the lessons aren't being learned quick enough...There seem to be a lot on unnowns in use that raise serious questions. We need a feedback loop on all of this post-haste before we all end up having a badly exercised immune and personal heating system. Whatever doesn't kill you may not make you stronger, but it usually toughens you up. Look before you leap in this case.
you possible could save money with a block build. but would lose the benfiets of the SIPs: quick erection and watertight house, off site construction mm perfect etcLooking to get an airtight build and have gotten a quote of 75000 for two storey 2550 sq ft house with sips.....seem very expensive. I know it provides a lot as well as erection for that price but surely could achieve similar u value and finish with masonry buils for 20-30 grand less??! Any thoughts?
Looking to get an airtight build and have gotten a quote of 75000 for two storey 2550 sq ft house with sips.....seem very expensive. I know it provides a lot as well as erection for that price but surely could achieve similar u value and finish with masonry buils for 20-30 grand less??! Any thoughts?
Its in a recent thread on AAM, but "recent" for me is 100 posts ago and more so its not to hand.could you post this data please, thanks
Translates to "pay me the money now and I promise you this will all work out in your favour over the next twenty years" - snake oil.often times the carbon footprint/ Embodied energy increases for the actual build, but the energy savings and hence carbon footprint during the buildings lifespan is much less and more than compensates..
I'm not confusing anything - I'm implying by my question that "on-demand" wall vents don't seem to work!yes 'wellness' is most important here as is occupant comfort but you confuse required ventilation with uncontrolled air-infiltration otherwisde known as drafts!
If you follow the exchange a bit, it might become clear, but you seem to have missed my point abovei dont understand your question
Well I'm glad we agree on something, because there are a lot of reports from companies claiming to have done the research that unless systems and insulation are closely tailored to the needs of the occupants and the house and well fitted, they will fail to achieve what they promise.The issue you raise regarding the feed back loop is interesting. there was a post occupancy stage (in I believe) the pre 80's RIBA which was removed probably due cleints not wanting to pay for it. But it is definitely something that should be revisited. there is also the issue that architects and clients not wanting their 'sick buildings' known as a sick buildings and so maybe the lessons aren't being learned quick enough...
I don't believe it translates as that at all! unfortunately the "passive systems" / "on-demand" as you call them are not working particularly the 'hole in wall ventilation'. and any of the "snake oil" is down to you and I to decipher picking through the claims made by suppliers. this began with you refuting the need for Air-tightness which is as necessary as insulation imo but that should not be confused with proper ventilation or breathability of structureTranslates to "pay me the money now and I promise you this will all work out in your favour over the next twenty years" - snake oil.
One of the major problems I am seeing at the moment is people are making their houses very airtight achieving less than 2 air changes per hour. In other words the house is nearly sealed. However, they are not allowing for a adequate ventilation system so in some cases the attic insulation is dripping wet and sagging. This happened when we had the snow last year and then we had amild spell after. The Irish weather is so unpredictable.
Many self builders and housebuilders are constructing houes as follows: traditional block construction with insulation in cavity, sand cement internal face of external walls to achieve airtightness, mushroom fix 37.5mm insulated plasterboard to internal face of external walls, seal around all penetrations and opening in walls, floors and ceiling with Intello plus seal tape etc, 72mm insulated plasterboard in upstairs ceilings or to walls upstairs if it is dormar, 300mm attic insulation. Ventilation consists of HVAC units (€5k suply and fit), or just trickle vents in windows and wall vents as in traditonal construction.
dead as it doesnt comply with current Building regsI would love to hear your views on how a house should be built without using all this fancy new methods and by using the traditional cavity wall construction with 2 no. 100mm blocks on edge and a 110mm cavity with insulation. Or is this method dead as outlined by Joseph Little Architects.
this price seems ok for 250m2... I would however want to the contracts, the details (particular with slab, around opes, penetrations AND who repairs the air-tightness after other sparks/plumber are on-site), the air-tightness clause, the interface agreements between main contractor/ sip/ win etc. I would also be trying to get the same guys to do the cladding a roofing/flashings (if they were reasonably priced) as they would know their structure and possibly take more care...Sorry guys I didn't specify what they actually provide for the 70 k SIP Energy arrive to a prepared base, and supply and fit
This leaves a complete SIP envelope, suitably wrapped in protective membrane(s), and ready for the application of external finishes or cladding's, windows & doors, and roof finishes. It also takes out the need/cost for hollow core mid floor any internal mortar work though plaster boards and skim coat have to be applied. It is factory designed and precise and airtightness is guaranteed with a 5 day construction particularaly impressive. Ventilation is to be achieved using mvhr technology and thus control air loss rather than the hole in the wall infiltration method. Ive had a timber frame quote back as well since original quote and though it came in cheaper originally once all the add ins that are offered are calculatd in its more or less the same. What do ye think for the amount of work done in that time for that price?....keeping in mind that I am going down this route re air tightness, high spec insulation and integrated ventilation system anyway I just think though achievable with bricks and mortar the cost may become equivocal in the end
- all SIP rising walls - both external and internal
- joisting, decking
- upper floor walls (where applicable)
- gables
- SIP roof system
its like there's a mass of conflicting reasons, where by the end of a statement it seems like you need to go and visit a few well designed MVHR homes, that have kids! Now i do except that mvhr and sealed homes must be built properly and properly designed. but a 'super sealed' house works the same with kids and pets as any other house. you have a good building fabric, and a good ventilation system, opening the door does not change that. its no different to you or I as kids, getting told to shut the door to keep the heat in..I have serious concerns with the MVHR systems as posted previously.
And so far nobody has addressed how a super-sealed house is supposed to actually function with kids and pets.
The theoretical sealing and heat retention goes out the window when you factor in normal human activities.
so from the last few posts can I surmise that you would prefer that money be spent on electrical generation rather than modern methods of construction to reduce heating and HW demand in our homes?this points to the hole in the government strategy.
How we can get credits for generating electricity.
With these we can all make "free" cups of tea!
dead as it doesnt comply with current Building regs
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?