[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Strawbale] Rammed Earth and Strawbale
I am not sure I understand what is being asked...but I do know a combination
rammed-earth SB house which is being finished this summer in Spain. There
they used rammed earth in the south--as thermal mass to collect heat in the
winter and stabilize the temperature. They have prepared the wall with
vents so as to add on a Trombe Wall to add additional heating in the winter.
I have pictures if anyone is interested. Of course where they live it is
cold (even snows sometimes) in winter, but generally sunny!
It is a very dry climate.
They have insulated the foundations with natural corch pannels...if that
answers the insulation question.
Rikki Nitzkin
Aulás, Lleida, España
rikkinitzkin@earthlink...
(0034)657 33 51 62
www.casasdepaja.com (Red de Construcción con Balas de Paja)
> -----Mensaje original-----
> De: strawbale-bounces@amper....muni.cz [mailto:strawbale-
> bounces@amper....muni.cz] En nombre de strawbale-
> request@amper....muni.cz
> Enviado el: miércoles, 19 de abril de 2006 12:00
> Para: strawbale@amper....muni.cz
> Asunto: Strawbale Digest, Vol 7, Issue 3
>
> Send Strawbale mailing list submissions to
> strawbale@amper....muni.cz
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://amper.ped.muni.cz/mailman/listinfo/strawbale
> or, via email, send a message with subject or body 'help' to
> strawbale-request@amper....muni.cz
>
> You can reach the person managing the list at
> strawbale-owner@amper....muni.cz
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Strawbale digest..."
>
>
> Today's Topics:
>
> 1. combination rammed earth / strawbales (Ben Albu)
> 2. RE: combination rammed earth / strawbales (Patrick FRD)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 18 Apr 2006 23:56:13 +0200
> From: "Ben Albu" <ben@albu...>
> Subject: [Strawbale] combination rammed earth / strawbales
> To: "European strawbale building discussions"
> <strawbale@amper....muni.cz>
> Message-ID: <op.s774jzii5wtkfj@pc400mhz>
> Content-Type: text/plain; format=flowed; delsp=yes;
> charset=iso-8859-15
>
> Dear strawbalers,
>
> These days I have been thinking about some things concerning the
> construction of strawbale walls.
> I also had a look at the construction of walls with the rammed earth
> technique.
>
> Traditional, breathable strawbale wall : loam / strawbale / loam
>
> disadvantages of this "sandwich" construction :
>
> walls are difficult to finish straight, the same problem for the corners.
> setting up of a strawbale wall goes fast and easy, but loaming is a lot of
> work
> a loadbearing wall can shrink over time, and loam will crack.
>
> advantages of a rammed earth wall :
>
> construction is easy and goes fast (?)
> cheap (in materials, but it requires more loam)
> straight and beautiful result
> good loadbearing capacities
>
> disadvantages of this type of wall :
>
> poor isolation (for cold climates)
>
>
> I was wondering if somebody has some experience in making a combination of
> rammed earth / strawbale / rammed earth
>
> If yes ....
>
> Would the isolation properties be the same for this kind of construction
> compared to a classical strawbale wall ?
>
> What about the fire resistant ? Is it advisable to put the bales in
> between without loamfinish ? In Austria they finished a strawbale wall
> completely with wood, but they dipped it in loam before construction.
> Would this also be a requierement if the straw is set up between 2 layers
> of rammed earth ?
>
> Which advantages/disadvantages do you see for this type of construction ?
>
> What about he foundation ?
>
> I am also wondering if the time required to loam a strawbale wall would be
> +- equal to the construction of a rammed earth wall ?
>
> Are there other techniques to isolate a rammed earth wall ? (Not with
> foam, rockwool, etc ...)
>
> Thanks for your help.
>
> Ben Albu
> Belgium
>
> ben@albu...
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 19 Apr 2006 10:46:10 +0100
> From: "Patrick FRD" <patrick@frdata....uk>
> Subject: RE: [Strawbale] combination rammed earth / strawbales
> To: "'European strawbale building discussions'"
> <strawbale@amper....muni.cz>
> Message-ID:
> <!&!AAAAAAAAAAAYAAAAAAAAAHH18cgDB5RBolOS93rTwYnCgAAAEAAAAGOG7NBCTGxO
> l+eUPaNSbYoBAAAAAA==@frdata....uk>
>
> Content-Type: text/plain; charset="us-ascii"
>
> As a nwebi I don't know if this is the most appropriate way to reply but
> ......
>
> I have also wondered about increasing the U value of rammed earth walls.
>
> The shuttering for cavity or double rammed earth walls could be very
> complicated and time consuming.
>
> A viable option would be to build a single wall having 3 vertical layers
> rammed together. This could be
>
> 1050mm wider shuttering with a 450mm bale wall built in the middle and
> 300mm
> of earth rammed on each side. This is a very thick wall. The bale will
> move and be compresses during ramming so you will need a well coordinated
> team of rammers. With experiment the rammed earth could possibly be
> reduced
> to 250mm? You may need horizontal ties to stop it all falling apart
> possibly layers of chicken wire.
>
> As an alternative you could use expanded clay beads as the middle
> insulation
> layer. The beads could be mixed with clay or lime to keep some structural
> integrity. If you used 4-500mm shuttering and carefully separated the
> layers
> with temporary separation boards while filling and initial ramming then
> remove the temporary boards for final ramming. This will give a
> homogeneous
> insulated wall.
>
> Alternatively just remove all stones over 5mm in the earth and replace
> with
> expanded clay beads which will probably give the almost the same
> insulation
> benefit as a separate layer of beads and will be much quicker.
>
> Alternatively use a spray machine to apply the render and edge bead.
> Assuming you intend your building to be permanent the embedded energy and
> the CO2 emissions, involved in using a hired spray machine, will be
> trivial
> over the life of the building will be trivial and probably less that the
> energy involved in excavating the earth. Rammed earth walls particularly
> double ones, use a lot of sub-soil and unless you are going to do it by
> hand, removing topsoil, excavating and mixing the subsoil, replacing the
> topsoil, moving material to site involves a lot of energy.
>
> Having said all of that I think that rammed earth looks wonderful my best
> option is Bales with sprayed render for the outer wall and rammed earth
> for
> floors, internal wall, fireplaces and the bottom half or stairs.
>
> Warning ... none of this is tested just ramblings.
>
> On a point of clarity the word LOAM seams to have a Varity of meanings it
> is
> often used in Europe to describe inert sub-soil which would be suitable
> for
> earth walls, but in the UK it is used to describe top-soil particularly
> top-soil with lots or organic matter which would be a disaster if
> incorporated in earth walls.
>
> Patrick
>
> -----Original Message-----
> From: strawbale-bounces@amper....muni.cz
> [mailto:strawbale-bounces@amper....muni.cz] On Behalf Of Ben Albu
> Sent: 18 April 2006 22:56
> To: European strawbale building discussions
> Subject: [Strawbale] combination rammed earth / strawbales
>
> Dear strawbalers,
>
> These days I have been thinking about some things concerning the
> construction of strawbale walls.
> I also had a look at the construction of walls with the rammed earth
> technique.
>
> Traditional, breathable strawbale wall : loam / strawbale / loam
>
> disadvantages of this "sandwich" construction :
>
> walls are difficult to finish straight, the same problem for the corners.
> setting up of a strawbale wall goes fast and easy, but loaming is a lot of
> work
> a loadbearing wall can shrink over time, and loam will crack.
>
> advantages of a rammed earth wall :
>
> construction is easy and goes fast (?)
> cheap (in materials, but it requires more loam)
> straight and beautiful result
> good loadbearing capacities
>
> disadvantages of this type of wall :
>
> poor isolation (for cold climates)
>
>
> I was wondering if somebody has some experience in making a combination of
> rammed earth / strawbale / rammed earth
>
> If yes ....
>
> Would the isolation properties be the same for this kind of construction
> compared to a classical strawbale wall ?
>
> What about the fire resistant ? Is it advisable to put the bales in
> between without loamfinish ? In Austria they finished a strawbale wall
> completely with wood, but they dipped it in loam before construction.
> Would this also be a requierement if the straw is set up between 2 layers
> of rammed earth ?
>
> Which advantages/disadvantages do you see for this type of construction ?
>
> What about he foundation ?
>
> I am also wondering if the time required to loam a strawbale wall would be
> +- equal to the construction of a rammed earth wall ?
>
> Are there other techniques to isolate a rammed earth wall ? (Not with
> foam, rockwool, etc ...)
>
> Thanks for your help.
>
> Ben Albu
> Belgium
>
> ben@albu...
>
>
> ____________________________________________________
> European strawbale building discussion list
>
> Send all messages to:
> Strawbale@amper....muni.cz
>
> Archives, subscription options, etc:
> http://amper.ped.muni.cz/mailman/listinfo/strawbale
> ____________________________________________________
>
>
>
>
>
> ------------------------------
>
> _______________________________________________
> Strawbale mailing list
> Strawbale@amper....muni.cz
> http://amper.ped.muni.cz/mailman/listinfo/strawbale
>
>
> End of Strawbale Digest, Vol 7, Issue 3
> ***************************************