Photo from the National Park Service’s guidelines for maintenance of historic buildings.
WHY IS MAINTENANCE IMPORTANT?
I know you have heard us talk a lot about maintenance over the years if you have followed us for any period of time (certainly if you read our blog post on painting your home’s exterior from last week), but we cannot emphasize its importance enough, especially for owners of historical homes: MAINTENANCE IS PRESERVATION. To drive this point home, preservation is defined by the Secretary of the Interior’s standards as:
“to sustain the existing form, integrity, and materials of an historic property.”
Preservation is also the first step of “intervention” based on the Secretary of Interior’s standards and guidelines. Having a maintenance plan helps to preserve the building, slows the natural deterioration cycle, and helps maintain a budget of planned projects rather than major emergency projects (that can cause hasty decisions to be made that may permanently damage the structure).
INITIATE YOUR MAINTENANCE PLAN
You can begin to develop your maintenance plan and schedule by following the checklists in the National Park Service’s Preservation Brief No. 47 “Maintaining the Exterior of Small and Medium Size Historic Buildings.” The goal of the checklist is to ensure that the structure is sound and that water is kept out of the building. Having a regular routine looking at the exterior of the building – during a light rain or after a freeze – can help to determine where the water is coming in and can highlight problems that might otherwise go unnoticed.
REPAIR vs. REPLACEMENT
Once the maintenance plan is made, the decision to repair building components that have begun to deteriorate is an important preservation decision. Repairing rather than replacing helps to retain more of the historic fabric of the building (an important preservation goal). As we’ve noted in the past, and as the Secretary of the Interior’s Guidelines for Rehabilitation recommends, replacement in kind is preferable. Replacement in kind means to replace with materials that are the same as what you are replacing: wood for wood, stone for stone, etc. There is a little bit of wiggle room for “compatible substitute material,” such as epoxy. We choose replacement over repair in cases where 50% or more of something is deteriorated, based on guidelines. However, this is a judgment call as there is no hard or fast rule for this. Usually someone who does not work on older buildings or someone that has a replacement mindset will set this bar much lower. Another factor in replacement in kind is the material selection. For example, old-growth wood is much more rot resistant and durable than the second-growth wood available now. We typically use a tropical hardwood or salvaged wood (from an architectural salvage dealer) to ensure that the replacement wood is going to be durable. Make sure the wood components are solid wood, not finger jointed (finger jointing is the process of making smaller wood lengths into longer pieces – most trim and modern window and door frames are finger jointed). This allows water more access points into the wood. And, because modern finger-jointed wood is (usually) inferior second growth pine the deterioration process is accelerated. Ensure that all replacement wood is treated with a preservative (like BoraCare) and prime-coated with an oil-based primer on all sides. If you are using epoxy repair (which we do for smaller repairs and non-wood repairs such as metal and masonry) make sure you remove ALL rotten wood, use consolidant, and then the wood fill epoxy. Most epoxies can be sanded, molded (if necessary), and then finish painted.
THE “MAINTENANCE FREE” TRAP
Many of you have likely seen ads for maintenance free products for your home, promising you that you will gain a lot of time by installing their product on your building. Sadly, many maintenance free products are maintenance free because when it comes time to maintain them you just replace it for the new version of the product. This may save time, but it also keeps you stuck in the cycle of replacement: continually buying replacements to keep the product manufacturers in business. Meanwhile, traditional materials are “greener” and more cost-effective in the long run because they are repairable. Cost and eco-friendliness aside, there are other issues with maintenance free products in older buildings. The National Park service’s Preservation Brief No. 47 “Maintaining the Exteriors of Small and Medium Size Historic Buildings” offers the following cautionary notice for historical building owners:
“It is enticing to read about ‘maintenance free’ products and systems, particularly water-proof sealers, rubberized paints, and synthetic siding, but there is no such thing as maintenance free when it comes to caring for historic buildings. Some approaches that initially seem to reduce maintenance requirements may overtime actually accelerate deterioration.”
Often times, we will see water and moisture trapped behind these maintenance free products causing rot that is unseen until replacement is necessary.
- Links to our Facebook live video series from last year regarding maintenance of your historical home.
- Maintenance is Preservation – Day 1 – We discussed why maintenance is important, how to organize a maintenance plan, maintenance free products, and water – the “natural enemy” of buildings
- Maintenance is Preservation – Day 2 – We covered how to prioritize, your work, what a maintenance audit should include, and our maintenance question regarding paint
- Maintenance is Preservation – Day 3 – We discussed repair vs. replacement, choosing repair materials, choosing a contractor, and specifics about wood repair/preservation
- Link to our Podcast from last year with more answers to older home maintenance questions posed by our listeners. The podcast included discussion of water infiltration through masonry walls, paint-related questions, as well as wood repair and preservation.