Rock Blasting FAQ’s


Do you have public liability insurance?

Yes, we have a $20,000,000 public liability policy that lists Rock Drilling and Blasting as our primary activity.

Always ask to see your Drill and Blast Contractors public liability insurance certificate of currency. Contractors with little experience or a poor track record will not be able to obtain public liability insurance.

Can you blast close to our existing home without causing damage (eg for a swimming pool)?

Blasting back yard pools is generally no problem. However, the closer the pool is to the house, the smaller the explosive charge must be so as not to exceed a safe vibration level – smaller blasts mean more of them which equates to more time and higher costs. In some cases non explosive rock splitting options can be used.

How do I know that you are not going to land rocks on my roof or crack my house?

We have all heard horror stories like this, thankfully most of these events occurred in times gone by when explosives were easily available to anybody who could demonstrate a genuine need. Back then, just about every builder, plumber and earthmover did their own blasting, often without any training and plenty of things went wrong. In recent years the tightening of controls over the supply and use of explosives has pretty much pushed out all but the drill and blast specialists.
The contemporary drill and blast specialist contractor should have a good understanding of blast vibration management methods including prediction and measurement as well as an understanding how to manage blasted rock to prevent it becoming airborne.

Our company is very serious about OH&S compliance, can you meet our needs?

We also take safety very seriously. We have a comprehensive Safety and Environmental Management Plan. Every job gets a site specific SWMS / JSA, and a blast management plan. All blasts are logged according to AS2187.2 and videoed. A precision seismograph records the vibration and sound levels for compliance verification if required.

The last guy that blasted for us covered the site in stone dust from his drilling, can you do something to prevent this?

Airborne stone dust can be hazardous. For this reason we go to a lot of extra trouble to capture stone dust with a state of the art multistage “H” rated HEPA Vacuum Dust Extraction system. This system keeps stone dust safely contained.

Demolition Dave has been an industry leader in safely managing stone dust using wet drilling since 2003. In 2007 we replaced wet drilling with our first HEPA Vacuum Dust Extractor.

What is the maximum number of holes that you can fire in one shot?

The short answer is “as many holes as we can safely cover”. 

Demolition Dave will save you time and therefore money wherever possible by using millisecond delay detonators on vibration sensitive projects. Every job is different but it would not be unusual for us to fire 30-40 holes in one shot using millisecond delay detonators. 

Modern blasting techniques utilise the process of millisecond delay blasting. These detonators have a built in time delay element so that every hole has a different delay period; in other words they all fire in very fast succession. Typical time delay spacing is 25mS per hole. The huge advantage in using this system is that it does not matter whether you fire 3 holes or 300 holes; the peak vibration level is the same.

Demolition Dave will always use millisecond delay detonators, where appropriate, when working near buildings. This is an intrinsic part of our blast vibration management strategy.

Not all blasting contractors have the licence endorsement to offer this service. If you want to save money, it is certainly worth asking if your blasting contractor will be using millisecond delay detonators.

A little history for those who are interested:- In the old days, shots were fired one hole at a time using a safety fuse. The next improvement to come along was Detonating Cord. This product allows many holes to be fired together – a BIG time saver… however, this has a VERY big drawback in that when all of the holes fire at exactly the same time, the resultant ground vibration can be VERY large. 

Blasting out in a paddock? No problem! But in a suburban backyard, this procedure will certainly bring complaints …or worse, damage claims. Lack of understanding on this point and/or the culpable use of detonating cord has caused a lot of damage in the past, to both buildings AND the reputation of the blasting industry.

Can you sell me some explosives?

NO we do not have a license to sell.

Big or small jobs expertly concluded.

As one of Melbourne’s more experienced rock blasting contractors, we can provide you with a cost-effective solution to assist in the excavation of even the very toughest igneous rock such as granite, granodorite and rhyodacite – the stuff that destroys excavator-mounted hydraulic breakers..

Rely on Dave’s extensive experience.

Whether you are building a highway or a driveway, digging a large dam, a back yard swimming pool, laying a service connection or a major pipeline, perhaps you are excavating under a house for a new room or seismic testing in remote areas, we can help make your project a success..

Dave has the right drill for every occasion and can drill blast holes from 19 – 102mm diameter

Our drilling equipment ranges from the small pneumatic hand drill for confined spaces, to the heavy “sinker” for small-medium size jobs or where access is an issue. For larger jobs we have a custom made excavator-mounted drill and a large hydraulic tracked drill is available if required.

Dave gives you the freedom to develop your land

Our services are available to the building and construction industry, earth movers, owner builders, pool companies, utilities, road construction companies, fencing contractors, the mineral exploration industry, government or anyone who has a legitimate need for the ultimate power tool!