If you have had a quote or a company/installer return to fix a box gutter issue, please do not let them talk you into the following.
1. A box gutter cannot be repaired by lining lead through it. This will have open joints in the areas which will continue to leak. Unless this is welders joints from a specialist lead welder which will cost far more than a replacement so this would not be cost effective.
2. A box gutter cannot be repaired by using fibre glass, fibre glass will not bond to the aluminium or the PVC. There are no outlets that are factory made for you to fibre glass to so you will always have a terminating edge on the aluminium or pvc that will leave the full job exposed to a leak.
3. A box gutter cannot be repaired by using felt, felt will not bond to the aluminium or the PVC. If it does at first the seasons will not like the felt and sitting in water. There are no outlets that are factory made for you to fibre glass to so you will always have a terminating edge on the aluminium or pvc that will leave the full job exposed to a leak.
4. A box gutter cannot be repaired by using fibre paint. No matter how much the price of the paint. This product can only cure out of water so used in the summer only. This product is so intermittent with bonding to PVC and Aluminium its just a waste of time.
5. A box gutter cannot be repaired by using silicone alone. This is how the manufactures used to instruct how to seal a sleeve of the PVC to the aluminium. This is not the case any longer. With water continuously in its area of sealing and seasons of expansion and contraction sealant will not solve the box gutter leak. Silicone only has around 20% expansion without its failure. If the silicone is only 3-5 mm thick, then this movement is less than 1mm tolerance.
6. A box gutter cannot be repaired by using bitumen tape or butyle tape. This would only be a temporary fix if it worked at all as the product is designed for wall flashing and is only for the weather/rain to run off it and not to be sitting in water all the time as you have with box gutters.
7. A box gutter cannot be repaired by using a welder as the two products that need to be joined are 80 % of the time aluminium and PVC plastics. The PVC would melt. The only time would be on an aluminium box gutters bend or joining sleeve. The issue for this again would be the cost of the welder and conservatory maintenance team being on site at the same time would be excessive.