The answer to 'patio installation yellowing' is that it is a common issue that can be caused by a few different factors. Patio pavers or concrete can start to turn yellow over time due to weathering, exposure to sunlight, or chemical reactions with the materials used. This discoloration is typically not a structural issue, but it can detract from the appearance of your outdoor space.
Some common causes of patio yellowing include: natural aging and weathering of the materials, improper installation or curing, chemical reactions with the soil or water, or exposure to UV radiation from the sun. Symptoms may include an uneven, blotchy appearance, a dull or faded look, or a yellowish tint to the pavers or concrete.