Spider Treatment on the Facade in St. Niklaus, Gentle on Heritage Buildings

For buildings classified as a protected heritage building, Annex II of the St. Niklaus building and zoning regulations (Art. 66) states that changes require approval from the cantonal heritage conservation authorities, including the renewal or alteration of paint, materials and elements such as windows, shutters, doors, render, timberwork or roofing. For heritage buildings worth protecting, the annex names the same elements, and there changes must be carried out in the spirit of heritage conservation and in close cooperation with them.

For spider treatment, this means the method matters. If a cleaning process could alter paint, render or a timber surface, it may fall under these rules on such properties. I clarify this in advance.

If a property is classified as protected or worth protecting, I first test the product and method on an inconspicuous trial patch and check whether the paint and render tolerate it. You can see how a treatment otherwise proceeds on the page spider treatment on the facade.

I discuss the details with the owners beforehand, and they involve the cantonal heritage conservation authorities where needed. If mice or cockroaches are also an issue at the same house, read more on pest control in St. Niklaus.