You may be asking yourself, “Can I lay tarmac over concrete?” If so, you will need to take certain precautions. For one thing, you must make sure that the concrete is stable. Otherwise, you might risk damaging the new asphalt. In addition, improper installation of tarmac can lead to cracks and heaving. If you have never laid tarmac over concrete before, you should seek professional advice.
laying tarmac over concrete
If you are planning on laying tarmac over a concrete driveway, you should first prepare the area. Ensure that the base is uniformly thick and grind any concrete expansion joints before installing the tarmac. In addition, paving fabric should be laid over any expansion joints in the concrete so that the new tarmac will adhere properly. Afterwards, use hot mix asphalt and an appropriate adhesive to lay the tarmac.
While tarmac can be laid directly over a concrete or paved driveway, you should remove any grass before laying it. You can also opt for a professional installer who will use a high-temperature paving machine to prepare the surface. Professional installers can complete the job in a matter of hours. Unlike DIY paving, you don’t have to use a heavy-duty hammer to lay the tarmac.
laying tarmac over concrete yourself or hiring a professional
When it comes to laying tarmac over concrete, there are a number of different options. While it is possible to lay tarmac yourself, it is often easier and faster to hire a paving contractor. A tarmac contractor will have access to professional paving machinery and liability coverage. Additionally, tarmac contractors will be able to lay a driveway in a much shorter amount of time than you could.
laying tarmac over concrete causes heaving
Many factors can contribute to the heaving of concrete, but the most common is a lack of compaction in the soil underneath the slab. In California, the ground is very dry, which causes it to expand and cause heaving. Other factors can also cause concrete to shift, including tree roots, underground wiring, plumbing, and minor movements underneath. In some cases, excessive weight placed on the concrete can cause it to crack, creating pressure cracks.
Another factor that contributes to heaving in a driveway is water. If the concrete is too wet, water can enter the joint between the two layers. This can cause the joints to widen and allow water to move underneath. When this happens, the new asphalt can be damaged. If this is the case, a specialist in concrete repair will be able to identify the problem and fix it.
laying tarmac over concrete causes cracking
The process of laying tarmac over concrete usually results in the development of cracks. Initially, cracks are seen at large intervals and progress to smaller intervals with time. However, studies on plain pavements have shown that the use of intermediate sawed joints can help to control the differential cracking problem. In some cases, cracks may not appear until months after a pavement has been opened to traffic.
In addition, laying asphalt over concrete has its disadvantages. The base of concrete can be prone to cracking as it is susceptible to movement due to the expansion and contraction of the base. This will ultimately result in cracks in the asphalt layer. To avoid the problems associated with laying tarmac over concrete, it is advisable to lay special reinforcing fabric strips before overlaying. Once the concrete base is properly prepared, cracking will be minimal.