Reinforcement In Slabs

Slab on Ground reinforcement

Where should the reinforcement mesh go in slabs?

 

Understanding The Materials

Concrete – Strong in Compression, but weak in tension.

Steel Reinforcement– Strong in Tension, and strong in compression if the concrete can stop it bowing.

Myth Busting

Lots of concretors will tell you “We put steel the reinforcement close to the bottom of [read more…]

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Electrical Abbrevations

electrical drawing

Looking at an electrical plan, or reading an electrical specification, and wondering what all the abbreviations are?

Well here are some of the more common ones you may encounter, many with links to other posts:

3ph – Three Phase Power AC – Alternating Current ACU – Air Conditioning Unit CB – Circuit Breaker [read more…]

Efflorecence

Efflorecence

What’s that white powdery stuff that can appear on brickwork?

Well the technical name is Efflorecence

It can also appear on concrete!

What Is Efflorescence, & How Is It Caused?

Basically it is caused by water soluble salts contained in either the mortar, or the bricks.

When any water in the wall (that has dissolved [read more…]

Construction – Holes In Timber Frames

Hole in timber frame

The house frame has all been completed, and inspected . . . . and then some idiot plumber drills holes in the frame like this!

Right through the bottom plate, and the top plate, of both storeys of the house!

Holes are often drilled in:

Studs* Plates* Beams /Joists

* see Basic Timber Frame for [read more…]

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Concrete Cracking – Pattern of Fine Cracks

Mapping Cracks

Some people refer to these as ‘spiderweb’ cracks but the technical name is ‘mapping cracks’.

That’s because they can look like a street map.

Generally they are much more obvious after rain as water seeps doown into the cracks.

These cracks are typically only 2-3mm deep and are as a result of the surface concrete [read more…]

Concrete Curing Membrane

concrete curing spray

Photo thanks to www.civilblog.org

One simple thing to improve the quality of concrete is to use a spray applied curing membrane. . . it’s a pity that this techniques doesn’t seem to be used much in Australian domestic building.

Purpose of Membrane

These membranes main purpose is to prevent the loss of moisture during [read more…]