State parks and forests contain more than 4,800 buildings.
This includes visitor centers, offices, maintenance and storage buildings, education buildings, pavilions, cabins, bath houses, and modern and rustic bathrooms.
All these need roof repair or replacement on a regular schedule.
Depending on the type of roofing material, a roof can last on average 20-40 years for asphalt shingles, 30 years for wood shingles, and 40-50 years for flat rubber roofs.
Periodic maintenance for heating and cooling (HVAC) systems, wiring, plumbing, carpeting, and painting is also needed.
For instance, the typical lifespan of an HVAC system with routine maintenance is 25 years, but that can be reduced to as little as 10 years without adequate maintenance.
SFGate. The Average Life of Roofing. http://homeguides.sfgate.com/average-life-roofing-94238.html. (Accessed on 7/14/2017)
Comfort Pro Heating & Air Conditioning. What is the Life Expectancy of my HVAC System? https://www.comfort-pro.com/2015/03/what-is-the-life-expectancy-of-my-hvac-system. (Accessed on 7/14/2017)
is the average lifespan for asphalt shingles
is the average lifespan for wood shingles
is the average lifespan for flat rubber roofs
Given that many state parks and forests are 50 to 100 years old, there are many buildings and other structures of historical significance.
For instance, there are more than 5,000 culturally or historically significant sites on state forest lands.
There are also 500 structures on the historical register within state parks, in addition to numerous others not listed but still of significant age.
Rehabilitation of these structures must consider the historic features while preserving their usefulness and safety.
50 to 100 years
is the range of ages of state parks and forests
on state forest lands are considered culturally or historically significant
are on the historical register within state parks