Australasian Timber

Constructi­on issues can be avoided

- IAN HAYWARD PRYDA ENGINEERIN­G MANAGER ANZ

CONSTRUCTI­ON schedules can often be challengin­g and any impacts to the flow of installati­on can be costly and lead to frustratio­n.

However, a number of the issues we see are repetitive and can be easily avoided on site with a little attention to detail in the design and planning stage. There are a number of common site issues but we’ll focus on two of the most common and easily avoidable.

One of my perennial favourites is mechanical services units or HVAC systems. Nearly every residentia­l house has these as part of their design and constructi­on. However, sufficient informatio­n is often left out of the architectu­ral plans.

In this digital age we need to be doing better.

Not allowing sufficient space to accommodat­e these units can cause major delays on site, as trusses will often need to be site-repaired to accommodat­e the voids required to house the units and potentiall­y the ducting systems.

A key considerat­ion to accommodat­e the units is the pitch of the roof – as this pitch decreases the allowable space to house the units decreases.

At some stage the ability for a unit to be housed within the void spaces created by the truss webs will diminish.

If the size, location, and weights of these units are known at the design stage they can be easily detailed into the job. For shallow pitch trusses, girder trusses running either side of the unit and trimming beams running between the girders can be utilised to house the unit. A typical example is seen right.

If there are no AC units on the plans it is a good idea for the detailers to raise this with the builder at the design stage to save headaches on site.

Another common issue occurs with conflicts created by pipework for waste systems – usually in floor spaces in bathrooms or other wet areas. Without sufficient detail on the plans, floor trusses/joists can often be in the way of the pipework required in the floor space.

These can be a major problem as rectificat­ion work normally has to work around the in-situ pipework, which can be challengin­g. The software providers typically have allowances to create void spaces and conflicts zone on their layouts, so if these areas are known at the design stage they can easily be worked around.

With a little attention to detail and some planning at the design stage, these common issues can be avoided and a smooth flow of trades will lead to an efficient build.

 ?? ?? •
Void space created to house AC unit.
• Void space created to house AC unit.
 ?? ?? • A low pitch truss which will create conflicts with housing the AC unit in the roof space.
• A low pitch truss which will create conflicts with housing the AC unit in the roof space.
 ?? ??
 ?? ??
 ?? ?? • A truss with large pitch can reasonably accommodat­e an AC unit.
• A truss with large pitch can reasonably accommodat­e an AC unit.
 ?? ?? • Hole cut in floor truss to accommodat­e pipework .
• Hole cut in floor truss to accommodat­e pipework .

Newspapers in English

Newspapers from Australia