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Sarking, Wall wrap sisalation & insullation - what is it?
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Author:  OMG [ Jun 22, 2009 10:41 pm ]
Post subject:  Sarking, Wall wrap sisalation & insullation - what is it?

Ok I am going to ask the dumb question & ask for answers in plain easy to understand girl language :oops:

I know what ceiling insulation is 8) , but is sarking & wall wrap sisalation the same thing?

Have heard people talking about the pros & cons of sarking but havent seen/heard about wall wrap sisalation which is standard with our builder?

Cheers

Author:  PeterH [ Jun 23, 2009 1:36 pm ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it?

This is the sisalation/wall wrap that we used. It just went on under the cladding. I'm not 100% sure of the purpose of it.

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Sarking is the same sort of thing again, but goes under the roof. Doesn't it? :?

Maybe someone more knowledgeable can help you out better.

Author:  dymonite69 [ Jun 23, 2009 6:13 pm ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it?

Wall wrap sisalation serves a dual purpose.

It is an air/vapour barrier and a radiant barrier.

It will prevent moisture entering the frame and condensation forming. Trapped condensation = mould.

An air barrier also reduces air movement through the wall batts which enhances their winter insulation value.

The metallic coating is a barrier to radiant heat and keeps the house cooler during summer. It is particularly effective on the western wall of the house.

We used Tyvek Enercor but essentially it achieves the same thing. Wall wrap is fairly cheap ~ $5/m2 and takes half a day to install. It is a worthwhile addition to the thermal comfort of your house which you cannot add later if you change your mind.

Author:  OMG [ Jun 24, 2009 8:29 am ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it?

Thanks for the info - wall wrap sisalation is stated as standard with our builder, as is R2.5 ceiling insualtation. I cannot see anything about sarking tho so will have to check with builder.

Cheers

Author:  dymonite69 [ Jun 24, 2009 12:04 pm ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it?

OMG OMG
Thanks for the info - wall wrap sisalation is stated as standard with our builder, as is R2.5 ceiling insualtation. I cannot see anything about sarking tho so will have to check with builder.

Cheers


Here are some definitions:

Sarking = moisture proof barrier, can be made out of any water impermeable material, e.g. plastic, tar paper, plywood. Usually polyethylene or RFL in Oz.

Radiant barrier = any material that blocks radiant heat (but usually not conducted heat), light coloured and metallic surfaces do this

Sisalation (TM) = a brand of RFL; used as both sarking (vapour barrier) and radiant barrier; in Oz has become synomynous with 'sarking' like Kleenex = Tissues, Hoover = vacuum cleaner, Esky = insulated foam container for beer (but see above)

Reflective foil laminate (RFL) - aluminium metallic coating over a durable backing e.g Sisalation, Tyvek Enercor, Insulco Foil. Can be produced in rolls or as sections. Various products for use under roof or in wall cavity.

Author:  OMG [ Jun 26, 2009 6:35 pm ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it?

dymonite69 dymonite69
OMG OMG
Thanks for the info - wall wrap sisalation is stated as standard with our builder, as is R2.5 ceiling insualtation. I cannot see anything about sarking tho so will have to check with builder.

Cheers


Sisalation (TM) = a brand of RFL; used as both sarking (vapour barrier) and radiant barrier; in Oz has become synomynous with 'sarking' like Kleenex = Tissues, Hoover = vacuum cleaner, Esky = insulated foam container for beer (but see above)

Reflective foil laminate (RFL) - aluminium metallic coating over a durable backing e.g Sisalation, Tyvek Enercor, Insulco Foil. Can be produced in rolls or as sections. Various products for use under roof or in wall cavity.


Ok thanks - guessing this is why builder has stipulated 'wall wrap' sisalation then.

Cheers

Author:  FireFox [ Aug 17, 2009 4:32 am ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it?

just to clarify, air--cell is another form of reflective barrier with some thermal benifits? we were looking to use it on our steel roof

Author:  dymonite69 [ Aug 17, 2009 11:42 am ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it?

FireFox FireFox
just to clarify, air--cell is another form of reflective barrier with some thermal benifits? we were looking to use it on our steel roof


Air-cell, etherm, protherm are all composite RFL products. They have a bulk insulator laminated in the structure but it isn't a lot. Around R 1.0. It helps a little but it not to the recommended levels for bulk insulation for most cities. It would be more effective to combine foil with batts separately.

You may get it away with it the sub-tropics.

Author:  FireFox [ Aug 17, 2009 4:22 pm ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it?

so its a good idea to put it just under my colorbond roof (which is dark blue) for heatsoak?

price i got from them was $8sqm

ill still have bulk insulation for the ceiling

Author:  dymonite69 [ Aug 17, 2009 5:50 pm ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it?

FireFox FireFox
so its a good idea to put it just under my colorbond roof (which is dark blue) for heatsoak?

price i got from them was $8sqm

ill still have bulk insulation for the ceiling


Foil can be as little as $3/m2.

The extra $5/m2 buys you R 1.0. It probably is similar to the difference from upgrading your bulk insulation by R 1.0

Author:  mikemix [ Aug 18, 2009 12:30 pm ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it?

FireFox FireFox
so its a good idea to put it just under my colorbond roof (which is dark blue) for heatsoak?

price i got from them was $8sqm

ill still have bulk insulation for the ceiling


I think its becoming more of a standard now for builders using colorbond, bluescope also recommend it for reducing noise such as metal creaking and rain noise

Author:  Energy_Assessor [ Sep 18, 2009 6:18 pm ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it?

Anticon (from anti-condensation) is becoming a more popular alternative. Anticon Roofing Blanket consists of a glasswool blanket adhered to an impermeable reinforced reflective foil facing installed under metal roof decks. Thus providing both condensation protection and efficient thermal protection. It comes in a range of sizes from 60mm (R1.3), 80mm (R1.8 ), 100mm (R2.3), 110mm (R2.5) and 130mm (R3.0). Exact thicknesses and R values vary with manufacturers.

Author:  donald01 [ Jan 13, 2010 8:36 pm ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it?

Quote:
I know what ceiling insulation is , but is sarking & wall wrap sisalation the same thing?


in addition....

wall wrap sisalation are specifically recommended for installation as wall wraps following rigorous testing of their individual performance characteristics and superior quality features in these applications.

Author:  MalinViktoria [ Sep 27, 2012 7:26 pm ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it

Just resurrecting this thread as I'm trying to figure out if we have enough sisilation and/or insulation in our new house. It states that it comes with "wall sisilation" and "R2.5 batts to the roof space". Is this going to be sufficient insulation in winter, or is it recommended getting more? We declined roof sarking because we don't have a colorbond roof (I've heard that's when it's important to sark) and because it was ridiculously expensive.

Author:  Stewie D [ Oct 05, 2012 9:50 am ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it

If you are in Queensland then you should look to install insulation more for keeping the heat out rather than colder areas where the emphasis is on keeping the heat in. To this end you should look at keeping the ceiling area cooler by sarking under the tiles.

Quote:
We declined roof sarking because we don't have a colorbond roof (I've heard that's when it's important to sark) and because it was ridiculously expensive.


As stated above $3 - $5 psm is cheap in my book for the benefits achieved. Unless the builder is trying to rip you off blind then it shouldn't be expensive at all.
Colorbond roofs should have foil backed batts blanket as sarking not the simpler and cheaper foil sarking that is more common under tiled roofs.

I
Quote:
t states that it comes with "wall sisilation" and "R2.5 batts to the roof space".


Not only should you have sisalation on the wall frames but you should also have 2.0 - 2.5 batts in the walls as well.
If it was me I'd also ask for R 3.0 batts instead of R-2.5 to the ceiling as well.
All these things just make your house more comfortable in both summer and winter as well as lowering your energy bills too of course.

What type of sarking did he quote you ?
How cold are your winters ? I can't imagine they'd be too bad in Brisbane.

Stewie

Author:  MalinViktoria [ Oct 06, 2012 11:21 am ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it

Thanks, Stewie, there was no specifications on the sarking just "sarking to roof, cross ventilation may be required". They quoted $1,390 for this, which is probably not super expensive, but I just didn't think it was necessary under tile roof. I've asked for a quote for wall insulation, but haven't gotten it yet. We're seriously considering adding this. As far as how cold it gets here, we're looking at building out west of Brisbane, and it gets much hotter in summer and colder in winter than closer to the city (where we live now). It does creep below 0 sometimes, and above 40, when closer to the city it's on average 5 degrees higher/lower.

Author:  Stewie D [ Oct 06, 2012 2:22 pm ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it

Sounds a few degrees hotter and colder than what we experience here. I've lived here for 17 years and only once had a slight frosting on my windscreen. Mostly never gets below 5-7 degrees in winter and no hotter than 32ºC with maybe once or twice getting over 35ºC in summer. Those R-values I quoted you are what we are aiming for at least if not more and we obviously don't have the higher fluctuations in temps that you do.

Quote:
All these things just make your house more comfortable in both summer and winter as well as lowering your energy bills too of course.

The comfort factor is the biggest issue for us.

Stewie

Author:  MalinViktoria [ Oct 07, 2012 5:44 pm ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it

So I asked the builder about wall insulation, and they can give us R1.5 batts all the way around the house for an extra $800 (although according to him, we "don't really need it"). Is this going to do anything and be worth the money, or is it the kind of thing that doesn't really have any noticeable effect unless you go R3.0 and higher? I don't really want to spend much more than this on insulation.

PS: It's 36 degrees here today (and we're fairly close to the city), and we're living without any form of aircon or wall insulation at the moment. It's almost unbearable! *lol*

Author:  Pepsi_Drinker [ Oct 09, 2012 12:13 am ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it

MalinViktoria MalinViktoria
So I asked the builder about wall insulation, and they can give us R1.5 batts all the way around the house for an extra $800 (although according to him, we "don't really need it")...... It's almost unbearable! *lol*


Have you answered your own question :D ???

IMHO, If you're planning to live in the house as opposed to build-and-sell, then insulation, and the best you can get, is a MUST !!

Depending on your particular builder, frame type, construction method and brand of insulation your builder uses there is actually a maximum thickness of insulation that will physically fit in your (external) walls.

Find out what this is and use it !!!!

Our plan is to spend $$'s on insulation and glazing to keep the home as comfortable as possible to reduce as much as possible the need for heating and cooling.

I don't know what the price of electricity is up your way, but $800 doesn't come close to covering our electricity bill for either the summer or winter quarters.

If we were to save (say) even 30% of our heating and cooling costs it wouldn't take very many quarters at all to pay back a (say) $2,000 or more investment in insulation.

And I'm pretty darn sure that the price of electricity isn't going to drop dramatically any time soon ::hyst:: ::hyst:: ::hyst:: !!!

P_D

( IMHO !! )

Author:  Stewie D [ Oct 09, 2012 8:25 am ]
Post subject:  Re: Sarking, Wall wrap sisalation & insullation - what is it

^ Wot 'e said

The highest R-rated batt for a 90mm stud wall is R2.5 ( that I'm aware of ) without going down alternative routes such as polystyrene sheets in the wall cavity etc.
Below is a screenshot from a pdf I downloaded from Fletchers regarding pink batts for both walls and ceilings.



Stewie

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