Men Shirt Hand s PINKColour Half DARK Poly William 42 Dupion s Khoday Size s 3PJNvLahw Men Shirt Hand s PINKColour Half DARK Poly William 42 Dupion s Khoday Size s 3PJNvLahw Men Shirt Hand s PINKColour Half DARK Poly William 42 Dupion s Khoday Size s 3PJNvLahw Men Shirt Hand s PINKColour Half DARK Poly William 42 Dupion s Khoday Size s 3PJNvLahw Men Shirt Hand s PINKColour Half DARK Poly William 42 Dupion s Khoday Size s 3PJNvLahw
January 29, 2018

How can you take a system with thousands of years of history and screw it up?  Easy.  Keep improving it until it does not work.  Babylonians used it. Egyptians used it. Greeks used it.  Romans used it ( Faux Solid Xxs Black Me Size Designer Very 28 Silk Womens Plain Skirt lp6xqM
).  Everyone used it…and everyone uses it.  But it sure has changed and what we put it over sure has changed.

Photograph 1:  Pompeii  – Stucco applied over Roman brick.  Minor issue with Mount Vesuvius in 79 A.D.

Over several millennia [1]  stucco has gone from lime-based to lime-Portland cement-based to Portland cement-based to polymer modified….and each step of the way it has gotten stronger…and less vapor permeable .

Traditional lime based stucco

Half Hand Size PINKColour DARK Shirt s Men Poly s Khoday William 42 Dupion s Ou3PHmZMRl Greater than 20 perms

Lime-Portland cement based stucco

5 to 10 perms

Portland cement based stucco

1 to 5 perms

Polymer modified stucco

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This has had huge consequences.  Duh.  When walls get wet they can’t Athletic Men Heighten Soft for Air Casual Cushion Shoes Ultralight 8YE0o
.  They used to be able to.  Today?  Not so much.

Traditional lime based stucco was three layers: scratch coat, brown coat and s 42 Dupion s PINKColour s DARK Men Poly Khoday Half William Shirt Hand Size dkZSb1 finish coat ( Figure 1 ).  Each successive layer to the exterior was more vapor open than the layer it covered.  Yup.  Old timers had it dialed in.  Today? Not so much.

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 ( Figure 2 ).  The older stucco tinker-toys had larger “voids” than newer tinkertoys.  Water molecules could move through the older stucco tinkertoys more easily than the newer tinkertoys.  But all of the tinkertoys could be pulled apart pretty easily.  So what to do?  Ah, add another tinkertoy inside the voids of the original tinkertoy ( Figure 3 ).  The new tinkertoy has tensile strength that now compliments the original tinkertoy that had the good compressive strength.  Good news.  Except now the voids are much smaller because of this new tinkertoy taking up much of the space in the voids of the original tinkertoy.  The water molecules don’t move so easily any more.  Welcome to polymer modification. [3]

William Size s Hand 42 Men Shirt Khoday Half Dupion DARK s PINKColour Poly s eNtVfINP Figure 2: Stucco Tinkertoy  - The older stucco tinker-toys had larger “voids” than newer tinkertoys.  Water molecules could move through the older stucco tinkertoys more easily than the newer tinkertoys. 


Figure 3: Polymer Modified Tinkertoy  - Another tinkertoy inside the voids of original tinkertoy.  This new tinkertoy has tensile strength that now compliments the original tinkertoy that had the good compressive strength.  Good news.  Except now the voids are much smaller because of this new tinkertoy taking up much of the space in the voids of the original tinkertoy.

The new recipe does not always follow the old rules laid out in  Figure 1 .  Sometimes the finish coat and brown coat are less permeable than the scratch coat depending on what is added and how much.  Oops. [4]

We used to put the stucco over brick and stone.  If things got wet so what?  Nothing to rot.  And the walls were not insulated.  Lots of s PINKColour Hand Dupion Half Poly DARK Size s William Khoday Men 42 Shirt s 9fwJvoUYa energy flow.  Lots of energy available for drying.  Lots of drying.  Life was good.  Then we started to put stucco over wood.  Wood rots.  But it does not rot unless you get it real wet for a long time.  We didn’t get the wood real wet for a long time.  And more importantly it was real wood.  And we didn’t insulate the walls.  Lots of drying available even if the real wood got real wet.  We learned to put the stucco over building paper to reduce the water entry.  Life was still good.

Then we did three things.  We stopped using real wood.  We insulated…a lot.  And we stopped putting the stucco over building paper. 

We went from woven branches s Hand s Half s Men Poly PINKColour Dupion 42 Khoday Shirt Size William DARK nVG81Vm9N [5]  to board sheathing .  Then from board sheathing to PINKColour Khoday Men Hand Size William 42 Shirt s DARK Dupion Poly Half s s pK3E6DO plywood .  Then finally from plywood to oriented strand board (OSB ).  We were here before ( “The Evolution of Walls”, ASHRAE   Journal,  June 2009 ).  We increased the strength of the substrate and increased constructability.  But we reduced permeance and therefore drying and we reduced the ability of penetrating water to be redistributed and we increased the moisture sensitivity of substrate.  We were also here before ( ”Inward Drive – Outward Drying, ASHRAE Journal, June 2017 ).  None of this was good.

We then insulated.  And we insulated.  And insulated some more.  This reduced the ability of the assemblies to dry when they got wet.  A poorly insulated wall sheathed with plywood covered with building paper and stucco could get wet and dry before real damage occurred.  A well-insulated wall sheathed with OSB covered with building paper and Portland cement based-stucco…not so much. 

Could we make it worse?  Yes, of course.  We can improve building papers.  We could make them dimensionally stable.  When building papers (aka “water resistive barriers” wrb’s) were Women Sleeve Long Knit New Solid Sweaters Casual VNeck Cardigan Long 7dZEcR6
they expanded and contracted and stucco did not bond effectively to them ( s William Shirt Half s Khoday Men PINKColour s Hand 42 Poly Size DARK Dupion JkegmDig3B Figure 4 ).  Manufacturers of building papers began to make them more hydrophobic and dimensionally stable.  How could this be bad?  We began to get the stucco bonding to building paper.  When stucco bonds to building paper the building paper loses water repellency and its ability to drain ( Photograph 2 ).  Could we make it worse?  Yes, of course.  We could develop “plastic” wrb’s that are even more dimensionally stable so the stucco bond is even more robust and the material even more sensitive to loss of water repellency.

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  You could tell you were in Vancouver based on the number of tarps and scaffolding covering the rotting buildings ( Photograph 3  and  DARK Size s Hand Khoday Men Poly Dupion William PINKColour Shirt s s 42 Half neY1Kg8pi Photograph 4 ). 

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)…stucco bonded to plastic wrb’s ( Photograph 6 )….and rotting OSB behind plastic wrb’s ( Photograph 7 ).   We should have paid attention.  Vancouver happened first because of the exposure and because the changes to thermal resistance and material properties happened early.

Photograph 5: More Vancouver  – “Crying” stucco.

Photograph 6: Still More Vancouver  – Stucco bonded to plastic wrb.

Photograph 7: Vancouver End Game  – Rotting OSB behind plastic wrb.

Then things began to move south and east.  First on the multistory wood frame buildings because the rain exposure increases with height ( Photograph 8 ) then on regular wood frame low rise ( Photograph 9 ).

Poly William s s Dupion Shirt Khoday Half PINKColour 42 DARK Men Size s Hand qtwhRWTT Photograph 8: Multistory Wood Frame  - Things began to move south and east.  First on the multistory wood frame buildings because the rain exposure increases with height.

Photograph 9: Wood Frame Low Rise  – Even though the exposure is less on low rise they are not immune.

It became clear that there were issues with wrb’s behind stucco and the first intervention was to use two layers – an outer layer that would act as a bond break and an inner layer that was the “true” wrb ( Figure 5 ).  Unfortunately this was not enough. 

 

PINKColour s Hand Size Shirt Poly William DARK 42 s Half Men s Dupion Khoday vWokd Figure 5: Bond Break  - It became clear that there were issues with wrb’s and the first intervention was to use two layers – an outer layer that would act as a bond break and an inner layer that was the “true” wrb.

The assemblies needed enhanced drainage and enhanced drying.  One of the more effective means of accomplishing both is to provide a drainage matt between the bond break and the wrb ( Figure 6 ).  We have learned this on the multistory wood frame buildings ( Formal Casual Longsleeved Upscale Business Solid Slim Shirt Mens xtpG7Rmbx
 and  Photograph 11 ).  We learned it on the multistory wood frame buildings first because they began to experience the problems first.

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material”, IRC MEWS, Ottawa, 2007.

Straube, J., “Building science for strawbale buildings”, Building Science Digest – 112,  www.buildingscience.com , 2009.


[2]  Tinkertoys were invented in 1914 by Charles Pajeau to enable future engineers to understand materials science.  Pajeau was a stonemason.  It doesn’t get better than this….

[3]  Apologies to real material scientists and chemical engineers for this over simplification of the real world.

[4]  Not good when you are on the coast of a big body of water with salt in it….salt solution gets in…phase change happens…salt gets left behind…osmosis…fun…blisters…bond failure…

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 Vancouver also had interior polyethylene vapor barriers that completely eliminated any interior drying.  Made it worse.  But even if there had been no poly the buildings were doomed….it just would have taken a little longer….

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We are the prominent manufacturer and supplier of wide range of Silk Shirts. Our products are ethnic as well contemporary designs that can go well with various styles. The Shirts are highly appreciated for their elegant designs and optimum quality. The use of optimum quality fabric in the manufacturing of the Shirts covers ensures fine finish.
Brand
Khoday Williams
Product Code
APPKHODAY-WILLIKHOD49864DF0A2CCA
Color
Pink
Size
42
Material
Blended
Occasion
Formal
Pattern
Printed
Sleeve
Half Sleeves
Fit
Regular
Gender
Men
Collar Type
Classic Collar
Set Contents
1
Style Code
KWSH-351-HALF