Frequently Asked Questions

How can I make delivery safer?
When you order, please let us know about any hazards our drivers might encounter on the way to your jobsite. Hazards include low power lines, soft dirt, septic tanks, narrow and curvy driveways, entrances on busy roads, bushy trees, low limbs, and other obstacles we should know about. To assist you, use the attached JOBSITE form.

Do you finish concrete? Can you lay down rock? Do you pave driveways?
Central Pre-Mix is not a contractor but will offer referrals upon request. CPM is one of the largest suppliers of aggregates, concrete, asphalt, and construction and landscaping products in the Inland Northwest and Southern Washington areas.

Do you have concrete pump trucks?
CPM does not provide concrete pumping equipment but will provide local referrals upon request.

How do I order concrete? How do I order rock?
Click here for a list of our location office numbers.  

What product do I need to use?
CPM offers a variety of performance mixes to meet your needs. Please contact a customer service representative or sales representative to learn about the best options for your project.
Click here to see your nearest location.

Should I call in advance to order material?
Yes. For concrete and aggregate orders, please call two to three days in advance for optimal service. For large orders, a one-week notice is highly recommended to meet your scheduling needs.

Where are you located?
We have many locations in Washington, Idaho, and Oregon. 
Click here to see a list of our locations.   

I don’t have an account. How should I pay?
Customers without an account must pay COD (cash/credit card on delivery). CPM accepts MasterCard and Visa. COD customers can provide credit card information at the time of order, or cash at the time of delivery. If you want to pay by cash, please pay the driver. Exact change is preferred.  The driver must receive payment prior to unloading any material.
Click here for a credit application.

What are your minimum orders?
CPM's minimum rock order for delivery is 10 tons. One cubic yard is the minimum order for concrete, but extra fees are added to concrete orders of less than 5 yards.
Please check with the dispatch location near you for more information.

Why do you add a fee to small orders?
When CPM sends a truck and driver to your location, our equipment and payroll costs are the same whether we have two yards in the drum or 10 yards. The minimum delivery charge helps offset the cost of the truck and driver for small payloads.

How do I find out when load/road restrictions are in effect?
Load limits are typically in effect early spring but are imposed when the road districts believe the road surface break up is occuring.  Please refer to the following web links and phone numbers for additional information:
Spokane County Road Restrictions (509) 477-3600 (website link)
Idaho (website link)
Post Falls (208) 765-3717
Worley (208) 664-0483 (website link)
Eastside (208) 667-6297
Lakes Highway District (208) 772-7527
Spirit Lake (208) 623-2131 

What is truck time?
Truck time is the fee we charge when a customer exceeds the time limit for our ready mix trucks on the job. Each delivery recipient is allowed a certain amount of time to unload the truck before additional time is billed.  The quicker the turn-around on the truck, the sooner that truck is available to make their next delivery. The goal is to reduce delivery delays for the next customer and provide top-notch customer service. The "gold-standard" for on-time deliveries in the ready-mix industry is 90%, and CPM's goal is to meet or beat this target every day. Depending on your location, when allowable time is exceeded, the charge for truck time can be as much as $1.60 to $2.00 per minute extra.

Why does concrete crack?
Part of the reason is that concrete has a high compressive strength (it can hold up a heavy load) but a relatively low tensile strength (the force that keeps it from pulling apart). Concrete with a compressive strength of 4,000 psi has a flexural (similar to tensile) strength of about 650 psi. There are many direct causes for cracking, but the most common is shrinkage. When concrete dries out, it shrinks and tries to move. When something prevents that movement – like a post, or a corner, or just a section of slab that’s too heavy to move – the concrete will crack. Another contributing factor could be poor sub-base conditions or preparation. For more information, refer to the NRMCA Concrete-In-Practice (CIP's).

How much material does a truck hold?
A full load of concrete is 10 yards. A full load of rock is about 15 tons in a solo dump truck and 32 tons in a truck with a trailer.

How much does a cubic yard of rock weigh?
There is no particularly accurate conversion, since the weight of a given unit of rock will change easily with changes in moisture and compaction. However, the general rule of thumb for ‘loose’ base rock is 1.35 tons per cubic yard.

What is fly ash? Why is it used?
Fly ash is the collected and graded particulate, or ash, given off by burning coal at coal-fired power plants. This material often ends up in landfills. CPM encourages recycling Fly ash to reduce CO2 by using this product in concrete. Fly ash replaces a percentage of the cement that goes into concrete and still provides a mix that meets specifications. Since fly ash particles are smaller and rounder than cement particles, they make concrete denser, less permeable to water, more resistant to chemicals and salts in the soil, easier to pump, and easier to finish.