In brief
- A low hardcore bid often leaves out compaction in layers, the sub-base blanket or cart-away of surplus spoil, not the hardcore itself.
- Ask for the bid's stated hardcore thickness, layer depths, compaction method and assumed haul distance before comparing totals.
- Where a bid excludes testing, agree in the contract who appoints and pays the laboratory before placement starts.
Contents
Hardcore placement underbidding risks in Qardho usually sit in the work the bid never priced: layer compaction, the sub-base blanket and cart-away of surplus spoil. The hardcore itself is visible and easy to count. The labour, water and plant that turn a tipped pile into a floor base are not.
Why do hardcore placement bids in Qardho come in low?
A low bid normally means the estimator priced hardcore as a supply-and-tip item and left the placement method out. Hardcore is placed in layers and each layer is compacted before the next goes down, using a plate compactor or roller with water added to reach the moisture the specification calls for. That work needs machine time, fuel, water and a supervisor on the layer, and each of those carries a cost. An estimator working from a bill item that only says "hardcore fill" can miss the layer count, the compaction passes and the water demand. The bill wording drives the price more than the site does. Ask the bidder to state, in writing, the layer thickness, the compactor they will use and where the water comes from. Hardcore thickness and layer limits are project-specific; confirm them against the engineer's specification rather than a rule of thumb.
What gets left out of a low hardcore price?
Beyond compaction, the commonly omitted items are cart-away of surplus spoil, the sand or quarry-dust blanket over the compacted hardcore, and any levelling or trimming of the formation before hardcore goes down. A bid may also assume the hardcore is tipped at the edge of the plot when the truck has to cross soft ground, or that the existing ground is firm enough to compact against directly. On Puntland sites where the formation has soft spots, the bid may not price removal and replacement of that material at all. It may also leave out testing: a laboratory visit for compaction checks or a plate load test is often a separate line item that a low bidder quietly drops. Ask which tests are included, who appoints the laboratory and whether the rate covers repeat visits if a layer fails. If the bid is silent, treat that as an exclusion.
How do you detect the gap before the floor slab goes down?
Compare bids line by line against the same quantity take-off, not against the lowest total. Write down the assumed hardcore thickness, the layer thickness, the compaction method and the haul distance, then send the same list to every bidder and ask each to confirm or reject it in writing. On site, watch a layer being placed: count the passes, check the water being added and look at whether the surface is level before the next layer. Walk a recently completed floor in Qardho and ask the owner or their supervisor what failed, if anything, and what the contractor actually did. Ask the municipal engineer's office whether it holds records or borehole logs for the area, and ask a local laboratory what it charges to check compaction on a layer. Unstable floor bases show up later as cracked screed, hollow-sounding slabs or doors that will not close, and by then the hardcore is buried.
What to do next
Send every bidder the same written schedule listing layer thickness, compaction method, water source, blanket material, cart-away and testing. Ask each to confirm or price the omissions. Award only when the returned schedules match. Then check your contract allows you to require a compaction record before the next layer is placed.
Frequently asked questions
Does a low hardcore bid always mean the contractor will do bad work?
No. It means the price was built on assumptions that may not match the specification. Ask the bidder to confirm layer thickness, compaction method and testing in writing. If they will not, the risk sits with the client.
Who should pay for a compaction test on hardcore in Qardho?
That depends on what the contract says. Decide before placement starts whether the client or the contractor appoints and pays the laboratory, and put the repeat-visit rate in the same clause.
Local reporting: this article is written for building work in Qardho and Puntland. Ground conditions, prices and rules differ between places; confirm the details for your own site.