What changes between the two wall systems?
The wall assembly, specified materials, installation work and surface preparation change between poured concrete and block foundation walls. Compare these details for the same proposed building and site.
The moisture-protection row follows Pacific Northwest National Laboratory (PNNL) guidance. A damp-proof coating reduces moisture passage through a wall but does not provide complete waterproofing.
| Poured concrete walls | Concrete block walls |
|---|---|
| How the wall is built | |
| Concrete hardens on site inside forms, the molds that give the wall its shape. | Concrete masonry units (CMUs) are individual concrete blocks laid in rows with mortar between them. |
| Details to identify in the design | |
| Confirm wall dimensions, connections and steel reinforcement, plus the specified concrete. | Confirm wall dimensions, connections and steel reinforcement, plus specified units, mortar and grout, the material used to fill designated spaces inside the blocks. |
| Delivery and installation questions | |
| How will the crew bring in the forms and place concrete at the wall location? | Where will blocks and other materials be stored, and who will carry out the masonry work? |
| Preparation for moisture protection | |
| PNNL describes applying a damp-proof coating directly to the concrete surface. | PNNL describes a smoothing coat of mortar, called parging, before damp-proofing rough masonry surfaces. |
Ask the project designer to identify the wall system and the details needed for your soil, building loads and site conditions. A comparison of reinforced poured concrete with unspecified block construction does not establish which completed design is suitable for your project.
Does either wall material make a basement waterproof?
Neither untreated poured concrete nor untreated concrete block makes a basement waterproof: concrete products are porous. Below-ground walls need a moisture-management plan, including appropriate surface protection and drainage.
PNNL distinguishes damp-proof coatings from complete waterproofing. Ask what protection your proposed wall needs, how the surface will be prepared and who includes the associated drainage work. A proposal that simply says “waterproof foundation” leaves too much unexplained.
What should you include in the cost comparison?
Include the complete foundation-wall work in the cost comparison: preparation, the specified wall construction, moisture protection and the work needed to connect it to the building. A price for concrete or blocks alone leaves out much of that scope.
Ask each bidder to separate wall construction from excavation, footings, drainage and other shared work. Footings are the supporting bases beneath foundation walls. For poured walls, clarify formwork and concrete placement; for block walls, clarify masonry labor, reinforcement and any specified filling of block spaces. Confirm who handles each item and which items are excluded.
Keep the proposed wall lengths, heights, openings and project requirements consistent when requesting alternatives. If a bidder changes the design, ask for the revised scope before treating the lower total as a saving.
For whole-project budgeting, use the concrete foundation cost guide. Its slab, crawl-space and basement ranges use the building's ground-level area; they are not prices per square foot of poured or block wall.
Who should you contact for foundation wall quotes?
Contact a foundation contractor who installs the wall system shown in your plans; block construction may require a masonry contractor. Confirm their scope before assuming one company can quote both alternatives.
Share the available drawings, site information and intended basement or crawl-space use. If the wall system is still undecided, say so and establish who will provide the design before requesting a final construction price. Contractors for Concrete helps homeowners prepare requests and seek contractor options; we do not design the foundation or guarantee a match.
Prepare a foundation contractor request