Building Paper/Wrap

• Use house wrap when framing a home to block out moisture and unwanted air.
• Housewrap defines all synthetic replacement materials for sheathing tar paper
• Housewrap functions as a weather-resistant barrier
•  preventing rain from getting into the wall assembly while allowing water vapor to pass to the exterior.

Major types of housewrap

• asphalt-impregnated paper or fiberglass (the original material, still widely used, also known as Asphalt Saturated Felt)
• micro-perforated, cross-lapped films
• films laminated to spunbond nonwovens
• films laminated or coated to polypropylene wovens
• supercalendered, wetlaid polyethylene fibril nonwoven ("Tyvek")

In relation to weather tightness, what are the 4 D’s?

·         Deflection – keeping water away from potential entry points

·         Drainage – providing means of removing water that does enter.

·         Drying – allowing any remaining moisture to be removed by ventilation or diffusion.

·         Durability – providing materials with appropriate durability.

 

drainage cavity

The function of a drained cavity is to provide a back-upshould occasional water get past the cladding.

• the cavity is soley a secound line of defence should a failure of the weatherskin occur.
• minimum cavity depth of 20mm.
• specifying continuous vertical battens.
• ensure the cavity always drains outside the building.
• ensure the cavity is vermin-proofed.
• closinf off the top of the cavity from all roof and eaves spaces

 

Cavity battens

Battens to form drained cavities for lightweight cladding are fixed to the wall framing after the installation of the wall wrap.

Reqiurements for timber battens are:

• installion after the wall wrap.
• a minimum thinkness of 20mm.
• a treatment to h3.1 minimum
• hot dip galvanised fixings(stainless steel fixings are required for ACQ and CuAz treated timber battens).
• vertical installation-if short cross battens are required the muxt be 100mm max.
• have a 50mm gap between them and a veritcal batten at each end and be installed with a slope to drained water to one end.

may 9th

Today we cut self-supporting paper for the roof it was cut at 1250x3500. We cut five lengths for the whole roof.  We measured out the roof so we could pre-drill the hole for the screws (hex -head) on the colour-steel sheets. We set a string line out the front of the front fascia at 50mm out for the distance and a guild for the colour-steel.

Placed self-supporting paper down on the roof and stapled to the purlins. Once one length of self-supporting paper is down and stapled we place a colour-steel sheet on top. Lined up flush with the side and the 50mm on the front fascia. When in position drilled down to purlins.

Roof rafters

measured out spacing and support blocks for insulation. . . . .

installing timber blocksfor roof insulation. . . .

May 2nd

BBQ TABLE

As a class we had to construct a bbq table and were split up to do different parts of the table. . . .
the bbq table had been treated h3 was the level of treatment. . . . .
the timber was 90x45. . . . .
Nadeem, tonga and i measured and cut fourteen 1500mm lengths for the top and seats of the table. . . .

we plained the sharpe edges and waited for everybody to finish there parts. . . . .soon after we tacted the two leg foundations. . . . .drilled and bolted them together. . . .finished off with nailing the top