Wind Speed

Buildings in Australia are designed to resist wind forces by complying with Australian Standards. The “design gust wind speed” for a particular site is determined by considering the height of the building, the location of other buildings and topography on all sides of the building. Houses in exposed locations or on tops of hills are designed for higher wind speeds and consequently higher forces than buildings in built-up areas.

We use the latest version of Australian Standard AS1170.2 to determine the wind speed for your structure. Where the building complies with AS4055, we can classify the wind speed using that standard too.

Call us for a wind assessment for your building today!

Residential Concrete Driveways

If you are after some definitive advice on residential driveway slab thickness, reinforcement and joint spacing then you have come to the right place. Check out this Residential Concrete Driveways and Paths manual produced by Cement Concrete and Aggregates Australia.

At Cornell Engineers we have been referring to this document since its release in 2006 and it’s still the best way to ensure satisfactory performance of your driveway slab. Remember that in the absence of better information, this is the manual that will be referred to in the event of a dispute about uncontrolled cracks in your driveway.

Don’t forget local authorities (councils) have their own requirements for driveways, cross-overs and paths. For example, here is the link to the Driveway Technical Standards for Brisbane City Council:

In you would like us to design a driveway slab for you please contact Matt Cornell of Cornell Engineers on 07 3102 2835.

If you have a cracked driveway slab, maybe we can help you. Call Matt Cornell for advice or to arrange an inspection.

Driveway Slab Reinforcement

Steel reinforcing mesh is used in driveway slabs to control the width and length of cracks in concrete. If the mesh is “walked in” or placed at the bottom of the concrete slab, it is ineffective and won’t control cracks. Ensure your mesh is correctly positioned when pouring by chairing it on bar chairs at 1000 x 1000 centres.

I was also asked recently if driveway slabs need the black plastic membrane (200 micron polyethylene membrane) under them before pouring. If you have the plastic on site, then I recommend using it. The purpose it serves is to prevent the dry ground sucking moisture out of the wet concrete. That moisture is needed by the cement powder in the chemical reaction called hydration. Don’t worry if your driveway slab has already been poured without the plastic membrane. Not having it won’t decrease your slab’s strength too much.

Got a structural engineering question? Ask us on the contact page or comment here!

Matt Cornell
Cornell Engineers

Five Questions with Craig Bullen

 House Raise and Build in Under

Craig Bullen is a Senior Sales Associate with Rema1282544846_1445804230image[1]x Executives.
His Owner-Builder project in Coorparoo has just finished construction!

We caught up with Craig Bullen and asked him 5 questions about his renovation project.

Describe the scope of your project?

Full raise and rebuild of a Queenslander.

What is the best feature of your project?

Huge rear patio with Cathedral ceilings overlooking the yard and pool.

What simple lesson have you learned during this project?

Compromise is unavoidable.

Would you attempt a similar project again?

Yes, because by the 5th time I have done it I will know what I am doing… 🙂

How did Cornell Engineers add value to your project?

Matt came up with a great design for engineering and was available for solutions as problems arose. Very happy with the service.

Thanks Craig Bullen

Talk to Craig Bullen about real estate in Brisbane. Here’s his link: Craig Bullen – Remax.
Thank you Craig.