• Concrete is normally used as a structural component in building projects and is a mix of materials while cement is just one ingredient in concrete, acting as a binder.

  • Concrete mix does not expand when water is added, so a good rule of thumb is that the area the bag of concrete mix takes up will be the same size it will be when water is added and it hardens.

  • Most concrete bags are 4 inches thick, so if you lay the bags end to end, you can measure out the number of concrete mix bags you will need for a designated square footage.

  • This rule of thumb is best used when laying a 4-inch thick concrete pad.

Need products or services? Call us today! 361-882-6513

Our Mission

Armstrong Lumber Co. is a locally owned and operating building supply store in south Texas, established in 1946. We are an old fashioned full service lumber yard providing quality construction materials to the professional builder, business industry, and individual.

  • We ensure to provide a balanced and diverse inventory with a goal of filling customer’s needs timely and completely.

  • Our sales team members are knowledgeable in every department, with over 100 years experience combined in the business.

  • We strive to provide an experience that surpasses any expectations.

We invite you to visit our location or contact a sales team member for your building needs!

“Our customer service makes the difference”