Month: September 2012

Want a Flat Roof ?

When thinking about a flat roof for your new home my advice is…..a roof can be:

  • Flat.
  • Inexpensive.
  • Have a long leak free life. 

PICK ANY TWO!

Sounds harsh but my experience, and others I have talked to, confirms this opinion.

My personal experience  with a flat roof was my parents house which had a pitched roof for the main house, but a flat roof for the garage.

After about seven or eight years the garage roof started to leak. Following 4 attempts to fix it they bit the bullet and had a pitched roof put on the garage. No more  problems in the next 30 years.

Yes, I know many multi-storey building have a flat roof without problems but with these tall buildings the roof is a small proportion of the total cost and so the builder can invest in a more sophisticated, and expensive, roofing system.

In your one or two storey property the roof will be a much bigger proportion of the total cost.

Most builders go for a low cost, low tech roof to keep the cost down. If it’s flat it will probably last until the guarantee period runs out and then you could be faced with ongoing repairs.

These comments will also apply to balconies over habitable rooms which are also prone to leaking.

If you do decide to have a flat roof you will need plenty of large downspouts (See Roof Choice – Risk)…………..otherwise you could have several cm of water on your roof in a storm, which will really tests the waterproofing.

 

Want Tiles or a Colorbond Roof see  What’s On The Roof

 

Interior Fashion

When we looked at remodelling our first house in 1976 the fashion colours for bathrooms fittings were avocado and sepia.

I really thought avocado would look nice………How very 70’s, or even how very early 70’s!

It was a good thing we decided to stick with white! Although I have to be honest at the time the main reason was cost, as we could use the existing toilet that was white.

If something is very fashionable it usually means it quickly gets out of date.

One thing that taught me early on was although its interesting to look at all the nice new designs of fittings and fixtures you should try and pick things that won’t date. Even though you are building a house for you to live in for several years you don’t want a dated when you come to sell.

Before you get carried away with a lot of ornamentation remember this will date faster than anything else and the ornamentation will be difficult to keep clean for a lifetime.

Some of trends I have seen a lot of recently are:

  • Mini down lights. We caught the down lights trend in 1991 when they used standard incandescent 100w bulbs. My worst lighting decision ever!
  • Stainless steel worktops, which has taken over from polished granite (although this is now being superseded by caeserstone)
  • Feature walls, why would you pay hundreds of dollars for something you could paint yourself in a couple of hours with $50 of paint.
  • Free standing cast iron baths, but how many of us have a bath and how do you clean round them?

How dated will these things look in five years time?

I have to admit one thing I did get caught up in, in 1991, was having a two person spa bath. I think it was only used by two of us once and only used at all about every two years in the ten years we lived at that house.

The best advice I can give is:

  • White bathroom fittings.
  • Light wood doors on kitchen units.
  • Neutral tones for carpets and tiles.

This make the house more of a blank canvas where you can show of your fashionable items like rugs, carpets, paintings, painted walls and furniture. At least they are easier to replace when fashion changes.

How have you become an Interior fashion victim?

For similar posts see Selection

 

Waffle Pod Raft Slab

A ‘Waffle Pod’ slab is now probably the most common Concrete ‘Raft’ House base. Its generally taken over from the Conventional Raft Foundation.

It’s an example of composite construction with polystyrene pods forming voids in the underside of the concrete ‘Waffle’.

This photo shows the pods, with the reinforcement placed over them, prior to placing the concrete.

Advantages

  • Cost
  • No trenches resulting in:
    • Simpler excavation; and
    • Flat site means site is easier to keep dry than trenches that collect water.
  • Waffle Pods bring house further out of ground. In an area that is wet the higher the better.
  • Better insulation from the ground meaning the floor will warm up quickly from cold. (especially if you go for in slab heating)

Disadvantages

  • More susceptible to bad workmanship – If the pods move during placing of the concrete.
  • More susceptible to bad drainage which can lead to soil heave if building on reactive clay
  • Lower thermal mass so less suited to passive solar design.
  • Thinner slab (typically 75mm rather than 100mm) means may not be as resistant to point loads such as jacking a car. Some people specify 100mm thickness for garage floor.
  • A thicker overall slab may be needed if you want Floor Drains (To allow for the dropped floor in those rooms)

Problem Sites

If  your block has difficult ground conditions its still possible to use a waffle pod slab with:

 

Also see Ground Conditions

 

Green Roof

How would you like to be mowing the roof of this house?

This is a ‘Green Roof’ something which is quite common in many Northern Hemisphere Countries but not so common in Australia.

They can work well in keeping a house warm with around 2-300mm of soil providing good insulation.

I’m not sure how well they would work in Australia on conventional houses.

  • You would probably need to water the roof in summer to minimise any bushfire risk.

Other issues would be:

  • Upgrading roof trusses for the much heavier loads from all that soil.
  • Finding the right native species to plant so you wouldn’t have to mow!

 

For more Unusual Houses and Fails go to What the………………….?

For Posts about Green Building see Sustainability

 

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