This is not uncommon. Price quotations from contractors can vary widely. In our experiences we have seen prices between contractors vary as much as 50% to 150%. This is due to several factors.
Factors may include: How busy contractors are, the type of overhead costs they are carrying, if they use union or non-union workers, whether they use skilled or unskilled workers (and in some cases even illegal workers), what market niche they cater to, as well as various other factors.
Because prices from different contractors can vary by such a wide amount, we recommend that you obtain a minimum of three quotes and thoroughly research their past work to choose the best contractor for your specific project.
Aluminum wiring was used quite extensively in homes that were built and/or renovated
between 1970 and 1980. Historically, aluminum wiring has caused some problems, including starting fires.
The problem with aluminum wiring is not the wire itself, but where the aluminum wiring is connected, for example at the electrical panel, light switches, electrical receptacles, light fixtures and junction boxes. These connections must be designed and approved for the different characteristics of aluminum wiring.
All electrical wiring expands slightly when electricity is flowing through it and contracts when the electricity is removed. Aluminum wiring is less effective as a conductor and therefore expands and contracts slightly more than traditional materials such copper wiring.
If your home has aluminum wiring, you ultimately do not have to replace the wiring, although that is an option. It is far easier and less expensive to hire an electrician to make sure that all the connectors are approved and are compatible with aluminum wiring. Any connectors that are not approved for aluminum wiring can simply be replaced by the electrician. Electrical connections will be labelled, either via symbols or words, if they are safe to use with aluminum wiring.
As always, it is always best to check with your insurance provider about their policies with regard to aluminium wiring as some insurance companies do not insure homes with this type of wiring.
This is a very common question. Stripping your old shingles off your roof and installing new ones directly on the roof sheathing will produce a better quality product. For example, the shingles will last approximately 10 to 20% longer and will look far neater. New shingles installed over the existing ones will take the shape of the old shingles and the roof will end up having a wavy appearance.
Another consideration is the number of roofing layers that are currently on your roof. The majority of roofers agree that you should have no more than two layers of roofing. Most homes have been designed to support no more than one layer of roof shingles on the roof. By installing more than one layer of roof shingles you are overloading the roof structure.
In addition, material warranty from shingle manufactures need to be taken into account. Most roofing manufacturers will not warranty their product if it has been installed on top of existing roof shingles.
Typically, despite the pitfalls, the reason many home owners choose to install new shingles directly on top of the existing roof is cost. It is less expensive as you are saving the labor to strip the existing shingles off your roof, as well as saving money by not having to dispose of the shingles at the local dump. The price saving can be anywhere from 20% to 50%.
The bottom line is: if your budget allows, strip the old existing shingles and install new roof shingles directly on the roof structure.