What type of drill is best? i used my bosch 8.5 amp hammer drill with a 1” bit. it lasted 10 minutes and shut down.

I used a rather large hilti drill for mine with a 1.5" bit and even that thing was very hot to the touch after two 16" deep holes. I would do a few then let it cool. I'd say that drill is a good drill for most things but not for a 1" drill that's over 9" long.

Can you drill smaller than 1.5 inch holes in the concrete? I have a 1 inch drill bit - hence the question.

You can use smaller holes, many clients including our own staff have had much success both with smaller and larger holes, however, the holes need to be closer together, no more than 6" apart and you must allow more time, we cannot guarantee the timing or results if you use anything smaller or bigger. Thank you for the great question!

I have a boulder 8' wide by 5 ' tall , will this work on it? And how far apart should i drill the wholes

Wow that’s a big rock, mine was 1 1/2 feet tall and 3ft wide. I drilled 1” diameter holes 1 ft deep and 6-8” apart and it worked great over night. It says not to drill all the way through and about 1ft apart in a grid pattern. Good luck.

Can I just pour it into cracks of the big rocks and not drill holes

I think it would work fine, efficiency would depend on depth and width of the crack versus the size of the rock. You'll need to dam the crack to contain it in the area you want to expand in. It is very runny when mixed and you do need to follow mixing and safety instructions. After the reaction takes place ( a day or so ), the stuff is as inert as limestone so no hazard that I am aware of. The primary ingredient is Slacked Lime & the Romans used it in cracks to break rocks for building roads so the history is extensive. I have some photos of concrete breaking that I did with it and I wish I could share them. Try mail to toymkr at a o l dot c

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Description

💥 Break ground without breaking your peace of mind!

POWERFUL EXPANSION - Delivers 18,000 PSI force to shatter concrete & rock effortlessly
FAST ACTING FORMULA - Visible cracks appear within hours, speeding up your project timeline
COST EFFECTIVE SAFE - Safer alternative to jackhammers with less labor and noise complaints
EASY 3 STEP APPLICATION - Drill, mix, pour—no heavy machinery or jackhammers needed
WHISPER QUIET DEMOLITION - Breaks materials silently—no noise, no vibration, no disruption

Dexpan Expansive Demolition Grout is a high-performance powder that, when mixed with water, expands with 18,000 PSI force to silently crack and break reinforced concrete and rock. Designed for professional use, it offers a vibration-free, noise-free alternative to traditional jackhammers and saws. One 11 lb. bucket covers up to 9 linear feet of 1.5-inch holes, with cracks forming within 2-8 hours, making it ideal for efficient, controlled demolition in temperatures between 50-77°F.

Specifications

Material	Rubber
Brand	Dexpan
Style	Compact
Item Weight	5.44 kg
Item dimensions L x W x H	20.3 x 20.3 x 20.3 Centimeters
Water Resistance Level	Waterproof
Item Form	Powder
UPC	810684020016
Net Quantity	1.0 count
Number of Items	1
Colour	clear
Surface Recommendation	Concrete, Rock
Manufacturer	Archer USA
Country of Origin	USA
Model number	Dexpan I, Dexpan II or Dexpan III
Item Weight	5 kg 440 g
Product Dimensions	20.32 x 20.32 x 20.32 cm; 5.44 kg
Item model number	Dexpan I, Dexpan II or Dexpan III
Item Height	8 Inches
Item Width	8 Inches
Power Source	Gas-powered
Included Components	Bare-Tool
Are batteries included?	No

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