The Forest Chapel is a new addition to the Tervajärvi campground. The chapel will mainly serve confirmation camps organised for 15-year-olds and as a venue for small weddings or christenings. The Forest Chapel is mainly used in summer and is not meant to be heated during winters. Underfloor heating provides comfort in early and late summer. The architecture of the chapel is an interpretation of the evolving role of sacral spaces. According to the architects, the form and proportions of the sacral building should convey the message of a place that provides space for tranquility.

The single most important component of the chapel is the glulam timber roof truss. The design was based on a visually appealing structure inspired by nature, a nearby lake and religious rituals. Besides being visually striking, the glulam beam structure plays the focal structural role. Assembling the chapel was carried out by volunteers and all the glulam parts came prefabricated from a factory.

The glulam beam is made of Finnish spruce, and formed of four 15 mm lamellas with a total cross-section of 60 x 240 mm. The wooden parts were manufactured industrially without having to sacrifice the precision and finish of the result. The roof is constructed from grooved planks made of Siberian larch. The roof and exterior surfaces were treated with tar tinted with charcoal black. The roof planks are only attached in the middle to prevent the wood from cracking as it expands and shrinks with fluctuating moisture levels. In addition, the wall and roof structures are permeable to water vapour, and the building is naturally ventilated along the entire rooftop ridge.